{"title":"EOFY2026 Optolong","description":"","products":[{"product_id":"optolong-l-extreme-f-2-filter-2-inch","title":"Optolong L-eXtreme f\/2 filter 2 inch","description":"\u003cp\u003e\u003cstrong\u003e1.  L-eXtreme F\/2  Introduction\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOptolong L-eXtreme F\/2 is a dual-band (500.7 nm and 656.28 nm, FWHM=7 nm) narrowband pass filter that meets the requirements for transmission at continuously varying angles. Astronomically characterised spectral lines (OIII, Ha) as the main transmission wavelengths, the OIII and H-Alpha nebula emission lines pass accurately at f2 - f3.3 Focal Ratio.   It's a product that Optolong has developed specifically for fast optical systems or fast focal ratio imaging systems. It has performed well on RASA, HyperStar, and other fast ratio telescopes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e♦Together with one-shot colour astronomical cameras, monochrome astronomical cameras, and Digital SLR cameras, you can fast and quickly obtain clear and detailed images of the deep sky;\u003c\/p\u003e\n\u003cp\u003e♦Ideal for fast optical systems, like RASA, Hyperstar, and other fast focal ratio telescope users;\u003c\/p\u003e\n\u003cp\u003e♦Recommended for using a fast optical system with a focal ratio from f2 to f3.3;\u003c\/p\u003e\n\u003cp\u003e♦Anti-light pollution、better contrast、more details of the celestial bodies: This filter cuts out background light and noise beyond the target celestial bodies to get better details and contrast of the images. L-eXtreme F\/2 can effectively block light pollution so that the images will not affected by unwanted lights and skylight of the background. You can quickly get satisfactory pictures in fast optical systems.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2. Spectrum and Characteristic\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"letter-spacing: 0em;\"\u003eBased on the characteristics of celestial bodies’ emission lines and light pollution emission lines, the L-eXtreme F\/2 retains the prominent nebula OIII and Ha colours while blocking most of the light pollution. Specifically designed and optimally calculated for the characteristics of a fast optical system, the L-eXtreme F2 always keeps both OIII and Ha bands having high transmittance, which helps users to capture nebulae emission lines in these bands more accurately and quickly and obtain better astrophotographic images.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"aligncenter wp-image-145765 size-full\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/L-eXtreme-f2a.jpg\" alt=\"L-eXtreme F\/2\" width=\"1000\" height=\"1015\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\n\u003cp\u003e▲The vertical axis is transmission in %.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/0ff2d7f395c427aa390ff53daf333cec-1.jpg\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e3. Coating Technology\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e·Multi-layers anti-reflection coating\u003c\/p\u003e\n\u003cp\u003e·Non-cementing optical substrate coating\u003c\/p\u003e\n\u003cp\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/p\u003e\n\u003cp\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/p\u003e\n\u003cp\u003eSKU: 14803\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":42045303750725,"sku":"14803","price":539.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/optolong-l-extreme-f2-filter-2-inch-947434.jpg?v=1731540833"},{"product_id":"optolong-l-ultimate-filter-2-inch","title":"Optolong L-Ultimate filter","description":"\u003cp\u003eIt's about a 3nm dual band designed to drastically reduce the effect of light pollution, the 3nm isolates the nebulae's emissions into H-Alpha (red) and OIII (green-blue). It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high and low pressure sodium vapor lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere. Maximizes the transmission of the main emission lines of the nebula in OIII (496nm and 500nm) and H-alpha (656nm). Used with DSLR, color\/MONO CMOS and CCD, however, this filter is not suitable for fast ratio systems.\u003c\/p\u003e\n\u003cp\u003eThe advantage of L-Ultimate is that it only passes through the emission lines OIII(500.7nm) and Ha(656.3nm), in which case all other light pollution emission lines are eliminated so that only the emission and reflection signals of the nebula are captured during imaging. Therefore, the sky background of the image is darker, and the contrast between the nebulae and the signal-to-noise ratio are improved to the greatest extent. In heavy light pollution areas, the product can also selectively filter light pollution and clutter signals through the emission lines of nebulae, and finally avoid the impact of light pollution on astrophotography.\u003c\/p\u003e\n\u003cp\u003eIt is different from the series of dual-narrowband L-eNhance and L-eXtreme in that L-Ultimate is a dual-3nm bandwidth filter that only passes through Ha and OIII emission lines. You will get a darker sky background, more contrast of the image and the suppression on stars. L-Ultimate has also been optimised in terms of halo performance, so that there is no obvious halo when shooting on a bright star object.\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"alignnone size-medium wp-image-145496\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/Graph--800x392.png\" alt=\"\" width=\"800\" height=\"392\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eFeatures\u003c\/p\u003e\n\u003ctable border=\"1\" width=\"600\" cellspacing=\"2\" cellpadding=\"1\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eoptical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFWHM\u003c\/td\u003e\n\u003ctd\u003eOIII 3nm Ha 3nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking range\u003c\/td\u003e\n\u003ctd\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront RMS:\u003c\/td\u003e\n\u003ctd\u003eλ\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n","brand":"Optolong","offers":[{"title":"1.25 inch","offer_id":43103921078341,"sku":"11601","price":500.0,"currency_code":"AUD","in_stock":false},{"title":"2 inch","offer_id":43103921111109,"sku":"11602","price":670.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/optolong-l-ultimate-filter-2-inch-880415.jpg?v=1731540833"},{"product_id":"optolong-l-pro-filter","title":"Optolong L-Pro Filter","description":"\u003cp\u003eOptolong L-Pro 1.25 inch is multi-bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast to broadband emission objects such as galaxies, reflection nebulae and globular star clusters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eWarning - Do not use this filter for solar purposes ! \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOptolong L-Pro (L-Professional) filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high \u0026amp; low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area with heavy light pollution.\u003c\/p\u003e\n\u003cp\u003eOptolong L-Pro is multi-bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast to broadband emission objects such as galaxies, reflection nebulae and globular star clusters. L-Pro is the best choice for light pollution suppression.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOptical glass fine material\u003c\/li\u003e\n\u003cli\u003eSpectrum: 380-750nm\u003c\/li\u003e\n\u003cli\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eFine-optically polished to ensure accurate 1\/4 wavefront and \u0026lt; 30 seconds parallelism over the both surfaces\u003c\/li\u003e\n\u003cli\u003eHigh transmission at major nebula emission lines (i.e. H-alpha 656nm, OIII 496nm\u0026amp;500nm, SII 672nm and H-beta 486nm).\u003c\/li\u003e\n\u003cli\u003ePrecision off-band blocking, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg class=\"alignnone size-medium wp-image-145135\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/Optolong-l-pro-light-curve--800x422.jpg\" alt=\"\" width=\"800\" height=\"422\"\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25 inch","offer_id":42151311409221,"sku":"10201","price":260.0,"currency_code":"AUD","in_stock":true},{"title":"2 inch","offer_id":42151311441989,"sku":"10202","price":350.0,"currency_code":"AUD","in_stock":false},{"title":"Canon EOS-C","offer_id":42151311474757,"sku":"10203","price":430.0,"currency_code":"AUD","in_stock":true},{"title":"Canon EOS-FF","offer_id":42151311507525,"sku":"10204","price":470.0,"currency_code":"AUD","in_stock":false},{"title":"Nikon NK-FF","offer_id":42151311540293,"sku":"10205","price":470.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/optolong-l-pro-filter-2-inch-706785.jpg?v=1731540833"},{"product_id":"optolong-l-extreme-filter","title":"Optolong L-eXtreme filter","description":"\u003cp\u003eL-eXtreme is a two 7nm bandpass filter which can be used with one-shot color cameras like DSLR's (digital SLR), and monochrome CCD cameras, it is also more suited for fast systems. The convenience and cost effectiveness of this filter allows amateurs to image a rich emission nebulas, even in bright, light pollution skies. Optolong believes the design of L-eXtreme filter would be better choice for fast systems in competitive price. It isolates the H-Alpha, and Oxygen III nebula emission lines so that the contrast and signal-to-noise ratio between nebulae were maximized. For people who is living in very light polluted areas, or when the moon is out, the L-eXtreme will be a good filter.\u003c\/p\u003e\n\u003cp\u003eUnlike the Optolong L-eNhance filter which is a tri-band (transmits Hb, Ha, and OIII), the L-eXtreme filter is dual band that passes Ha and OIII emission lines.The advantage of the L-eXtreme filter is that there is no transmission between the H-beta and OIII lines, as there is no nebula emission lines there. In this case, it isn't letting light pollution come through so that maximize nebulas signal and make the sky background darker while imaging. The L-eXtreme filter should better isolate the emission lines only and better protect from light pollution.\u003c\/p\u003e\n\u003cp\u003eHydrogen is the largest, the most primitive, the simplest, and the oldest element in the universe. Scientists consider that Hydrogen amounts to more than 90% of visible substance in space. Our sun is 5 billion years old, but so far hydrogen is still the key matter of nuclear fusion. While the sulfur element does not have much scientific significance, so keeping H and O is meaning for exploration of life.\u003cbr\u003eTherefore, we highlight H-a, H-b, O3 and O2, and reduce the signal of sulfur.\u003c\/p\u003e\n\u003ch5\u003eSpectrum and Characteristics\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003eSbustrate: B270\u003c\/li\u003e\n\u003cli\u003eThickness: 1.85mm\u003c\/li\u003e\n\u003cli\u003eTpeak: T\u0026gt;90%\u003c\/li\u003e\n\u003cli\u003eBlocking range: 300-1000nm\u003c\/li\u003e\n\u003cli\u003eBlcoking depth: light pollution line blocking \u0026gt;99%\u003c\/li\u003e\n\u003cli\u003eSurface quality: 60\/40\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront RMS: λ\/4\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg class=\"alignnone size-medium wp-image-145155\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/Optolong-L-eXtreme-curve--800x386.jpg\" alt=\"\" width=\"800\" height=\"386\"\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25 inch","offer_id":42151619723333,"sku":"13901","price":420.0,"currency_code":"AUD","in_stock":true},{"title":"2 inch","offer_id":42151619756101,"sku":"13902","price":540.0,"currency_code":"AUD","in_stock":false},{"title":"Nikon Z Clip-In","offer_id":44862003740741,"sku":"AS100313","price":420.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/optolong-l-extreme-filter-2-inch-422662.jpg?v=1731540833"},{"product_id":"optolong-variable-polarising-filter","title":"Optolong variable polarising filter","description":"\u003cp\u003eAdjust the brightness level of the Moon, Venus, and other bright objects with the Optolong Variable Polarizer. A standard Moon Filter is similar to a pair of sunglasses. They work fine, but sometimes the scene is too dark or too bright, and there’s not a lot you can do about it. A variable polarizing filter is much more flexible than a Moon filter. It allows you to set the percentage of attenuation by turning the top section of the two-piece filter. Simply attach the 2\" threaded filter to a like-sized eyepiece or Astro accessory barrel, and then slowly rotate the top half of the filter—it turns 360°—to achieve the results you desire.\u003c\/p\u003e\n\u003cp\u003eThe Optolong Variable Polarizing Filter also works great to cut brightness when you are using your telescope for terrestrial observations or photography. If you have ever done photography through a SLR or DSLR camera, you may have already been introduced to the qualities of a polarizing filter, since it is a very popular accessory for polarizing the light and making the sky appear bluer. You will especially appreciate a polarizing filter when viewing over water or photographing a scene that includes a river or body of water. Simply turn the filter until you achieve the most glare-free results—you will really see the difference.\u003c\/p\u003e\n\u003ctable border=\"0\" cellpadding=\"0\" cellspacing=\"0\" width=\"378\"\u003e\n\u003ccolgroup\u003e\n\u003ccol width=\"132\"\u003e\n\u003ccol width=\"123\" span=\"2\"\u003e\n\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" width=\"132\"\u003e\u003c\/td\u003e\n\u003ctd class=\"xl63\" width=\"123\"\u003e1.25 inch\u003c\/td\u003e\n\u003ctd class=\"xl63\" width=\"123\"\u003e2 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl63\"\u003eBrand\u003c\/td\u003e\n\u003ctd class=\"xl63\"\u003eOptolong\u003c\/td\u003e\n\u003ctd class=\"xl63\"\u003eOptolong\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl63\"\u003eType\u003c\/td\u003e\n\u003ctd class=\"xl63\"\u003eVariable Polarizing\u003c\/td\u003e\n\u003ctd class=\"xl63\"\u003eVariable Polarizing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl63\"\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2mm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\"\u003e\u003cspan\u003eClear Aperture\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd class=\"xl63\"\u003e26mm\u003c\/td\u003e\n\u003ctd class=\"xl63\"\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl63\"\u003eSurface Quality\u003c\/td\u003e\n\u003ctd class=\"xl63\"\u003e60\/40\u003c\/td\u003e\n\u003ctd class=\"xl63\"\u003e60\/41\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl63\"\u003eSurface parallelism\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1\/4λ\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e1\/4λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl63\"\u003eParallelism\u003c\/td\u003e\n\u003ctd class=\"xl63\"\u003e30\"\u003c\/td\u003e\n\u003ctd class=\"xl63\"\u003e30\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl63\"\u003eThread\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eM28.5*0.6\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eM48*0.75\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl63\"\u003eSingle Thread\u003c\/td\u003e\n\u003ctd class=\"xl63\"\u003eYes\u003c\/td\u003e\n\u003ctd class=\"xl63\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Optolong","offers":[{"title":"1.25 inch","offer_id":42151659831365,"sku":"12501","price":65.0,"currency_code":"AUD","in_stock":false},{"title":"2 inch","offer_id":42151659864133,"sku":"12502","price":75.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/optolong-variable-polarising-filter-2-inch-237545.jpg?v=1731540834"},{"product_id":"optolong-lrgb-filters","title":"Optolong LRGB Filters","description":"\u003cp\u003e\u003cspan\u003eOptolong LRGB filter set is designed for maximum contrast and with extremely high gradients for clear differentiation of colors. The LRGB filter set divides the spectrum into its components red, green, blue and luminance. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOIII emission overlaps on blue and green filters with maximum transmission to allow high efficiency and natural color imaging. Gap between green and red filters serves to block out the primary Sodium light pollution line at 589nm and improves color balance and separation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eRGB, parfocal:1:1:1\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCreat images in their true original colors showing a wealth of natural detail;\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSteep bandpass filters to eliminate UV and IR interference;\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInclude Luminance (UV\/IR Cut), Red, Green, and Blue filters to reproduce the star's color\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/www.optolong.com\/uploads\/images\/20210508\/27fe738c2ce6a5a69e998d648cc17b60.png\" width=\"853\" height=\"528\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25 inch","offer_id":42151690600517,"sku":"Opto-LRGB125","price":400.0,"currency_code":"AUD","in_stock":true},{"title":"2 inch","offer_id":42151690633285,"sku":"Opto-LRGB2","price":620.0,"currency_code":"AUD","in_stock":true},{"title":"36mm","offer_id":42151690698821,"sku":"Opto-LRGB36","price":470.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/OptolongLRGB.jpg?v=1731547539"},{"product_id":"optolong-uhc-filter","title":"Optolong UHC filter","description":"\u003cp\u003e\u003cspan\u003eThe UHC (Ultra High Contrast) broadband filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high \u0026amp; low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area with heavy light pollution.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMain Use and Performance\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for color CCD cameras and unmodified DSLRs.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUHC with narrower passband provides higher contrast than CLS. Thus it is more suitable for urban environment where you suffer from severe light pollution.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUHC has a substantial red passband and offer superb views for objects like the Orion Nebula (M42).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLight pollution filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cu\u003eWARNING\u003c\/u\u003e: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable border=\"0\" cellpadding=\"0\" cellspacing=\"0\" width=\"438\"\u003e\n\u003ccolgroup\u003e\n\u003ccol width=\"187\"\u003e\n\u003ccol width=\"251\"\u003e\n\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl65\" width=\"187\"\u003eSbustrate\u003c\/td\u003e\n\u003ctd width=\"251\"\u003eoptical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl65\"\u003e\u003cspan\u003eTave\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;95%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl65\"\u003e\u003cspan\u003eBlocking range\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e300-700nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl65\"\u003e\u003cspan\u003eBlcoking depth\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd class=\"xl65\"\u003eOD3, light pollution line blocking \u0026gt;99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl65\"\u003e\u003cspan\u003eSurface quality\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e60\/40 (Refer to MIL-O-13830A, MIL-C-48497A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl65\"\u003e\u003cspan\u003eTransmitted Wavefront RMS\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e  ¼ λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"20\"\u003e\n\u003ctd height=\"20\" class=\"xl65\"\u003e\u003cspan\u003e Parallelism\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Optolong","offers":[{"title":"1.25 inch","offer_id":42152607547461,"sku":"10101","price":99.0,"currency_code":"AUD","in_stock":false},{"title":"2 inch","offer_id":42152607580229,"sku":"10102","price":150.0,"currency_code":"AUD","in_stock":true},{"title":"Canon EOS-C","offer_id":42152607612997,"sku":"10103","price":170.0,"currency_code":"AUD","in_stock":false},{"title":"Canon EOS-FF","offer_id":42152607645765,"sku":"10104","price":200.0,"currency_code":"AUD","in_stock":false},{"title":"Nikon NK-FF","offer_id":42152607678533,"sku":"10105","price":200.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/OptolongUHC.jpg?v=1731557654"},{"product_id":"optolong-l-para-2-inch","title":"Optolong L-Para 2 inch","description":"\u003cp\u003eThe Optolong L-Para is a dual narrowband 10nm light pollution filter, specifically designed to filter out unwanted mercury, sodium, and LED light pollution emissions and enhance the detection of nebulae emission lines with a transmittance rate of over 85% and a 10nm FWHM for both OIII (500.7nm) and H-Alpha (656.3nm). It offers superior contrast and anti-halo effects for capturing detailed and vibrant nebulae images.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBroad Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA dual narrowband filter suitable for all telescope systems, adaptable to fast optics (focal ratios of F2, F2.8, F3.2, F4) as well as various standard\/normal focal ratio telescopes. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLight Pollution Resistance:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEffectively cuts off emission lines from mercury lamps, sodium lamps, LEDs, and other light pollution sources, making it applicable to Bortle Scale1- 7 dark skies. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Transmission Rate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIn systems with a focal ratio of F2 and above, the transmittance of nebula emission lines OIII and Ha exceed 85%, resulting in higher imaging efficiency. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eExcellent Contrast:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe high transmittance of nebula emission lines (OIII \u0026amp; Ha) combined with deep cut-off of light pollution bands significantly improves image contrast and detail richness. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAnti-Halo Characteristics:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe design has undergone several round of optimizations and many times of repeated testing ,resulting in a marked improvement in anti-halo performance, enhancing the capture of bright stars.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong L-Para is a brand new dual narrowband 10nm light pollution filter. The FWHM of L-Para is 10nm for OIII (500.7nm) and H-Alpha (656.3nm) respectively. The transmittance of nebulae emission lines at are both greater than 85% in system with focal ratios of F2 and above. It effectively filters out mercury lamp, sodium lamp, and LED light pollution emission lines. At the same time, it has excellent contrast and anti-halo characteristics, allowing you to capture detailed and vivid nebula images. L-Para is suitable for both normal optical systems and fast optical systems, such as RASA and Hyperstar systems. Even when light is incident at an oblique angle, it can still maintain high transmission rates to provide you with a clear and precise shooting experience.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/9b96104f725faacefa9ded926bfab8da.png?v=1734564754\" width=\"555\" height=\"364\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/ec92b95b51a57afdfb563adfcf710c88.png?v=1734564755\" width=\"555\" height=\"197\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/2700143340459da0e3aa3e900c9c60f4.png?v=1734564755\" width=\"555\" height=\"203\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":42223738945605,"sku":"","price":455.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/OptolongL-Para_0001_5.jpg?v=1734563445"},{"product_id":"optolong-uv-ir-cut","title":"Optolong UV\/IR Cut","description":"\u003cp\u003e\u003cspan\u003eOptolong UV\/IR Cut filter is designed for ultraviolet and infrared wavelength blocking to improve sharpness of the image as most of the optics are designed for the visible spectrum, because it’s very difficult to create a lens with the same focal point for the visible and IR spectrum.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt is used on a digital camera and the video, which do not have an IR protection filter toward an image sensor or were remodeled. This is important because unfiltered CCD and CMOS sensors are extremely susceptible to UV and IR rays just outside the visible spectrum that can have a very negative impact on image quality.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eMain Use and Performance\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for color CMOS and CCD cameras and modified DSLRs.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUse with monochrome CCD for astrophotography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAvailable to assist in focusing.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAct as an outstanding dust shield, which prevents the possibility of dust settling on the lens during long time exposure.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cu\u003eWARNING: \u003c\/u\u003e\u003c\/strong\u003eThe filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/UV_IR_cut.jpg?v=1741665611\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25 inch Mounted","offer_id":42500075978821,"sku":"10601","price":80.0,"currency_code":"AUD","in_stock":true},{"title":"2 inch Mounted","offer_id":42500076011589,"sku":"10602","price":120.0,"currency_code":"AUD","in_stock":true},{"title":"31mm Unmounted","offer_id":42500076044357,"sku":"10603","price":80.0,"currency_code":"AUD","in_stock":false},{"title":"36mm Unmounted","offer_id":42500076077125,"sku":"10604","price":100.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/Optolonguv-ircut.jpg?v=1741665521"},{"product_id":"optolong-l-synergy-filter","title":"Optolong L-Synergy filter 2 inch","description":"\u003ch3 data-start=\"87\" data-end=\"136\"\u003e\u003cstrong data-start=\"91\" data-end=\"136\"\u003eOptolong L-Synergy Dual Narrowband Filter\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"138\" data-end=\"573\"\u003eThe \u003cstrong data-start=\"142\" data-end=\"164\"\u003eOptolong L-Synergy\u003c\/strong\u003e filter is designed for astrophotographers using DSLR, color CMOS, or CCD cameras who want to achieve stunning narrowband results \u003cem data-start=\"294\" data-end=\"303\"\u003ewithout\u003c\/em\u003e switching to a monochrome system. By pairing traditional dual-narrowband (Ha \u0026amp; OIII) concepts with a unique \u003cstrong data-start=\"412\" data-end=\"440\"\u003e“Ha \u0026amp; OIII + SII \u0026amp; OIII”\u003c\/strong\u003e approach, L-Synergy overcomes the usual limitations of colour cameras and makes Hubble-Palette–style imaging accessible to everyone.\u003c\/p\u003e\n\u003cp data-start=\"575\" data-end=\"851\"\u003eWith this filter, you can produce deep, high-contrast SHO-like images of emission nebulae using your existing colour camera—no additional SHO filters or monochrome upgrade required. It’s an affordable way to achieve professional-level results even under bright suburban skies.\u003c\/p\u003e\n\u003chr data-start=\"853\" data-end=\"856\"\u003e\n\u003ch3 data-start=\"858\" data-end=\"898\"\u003e\u003cstrong data-start=\"862\" data-end=\"898\"\u003eWhy Choose the L-Synergy Filter?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"900\" data-end=\"1173\"\u003eThe L-Synergy is a \u003cstrong data-start=\"919\" data-end=\"950\"\u003edual 7 nm narrowband filter\u003c\/strong\u003e engineered for telescopes with an \u003cstrong data-start=\"985\" data-end=\"1015\"\u003ef\/ratio of f\/3.3 or slower\u003c\/strong\u003e. Years of optical refinement have produced a design that suppresses bright star halos while delivering extremely high transmission in the key emission bands.\u003c\/p\u003e\n\u003cul data-start=\"1175\" data-end=\"1772\"\u003e\n\u003cli data-start=\"1175\" data-end=\"1354\"\u003e\n\u003cp data-start=\"1177\" data-end=\"1354\"\u003e\u003cstrong data-start=\"1177\" data-end=\"1213\"\u003eSelective Narrowband Performance\u003c\/strong\u003e\u003cbr data-start=\"1213\" data-end=\"1216\"\u003eTransmits only the \u003cstrong data-start=\"1237\" data-end=\"1256\"\u003eOIII (500.7 nm)\u003c\/strong\u003e and \u003cstrong data-start=\"1261\" data-end=\"1279\"\u003eSII (672.4 nm)\u003c\/strong\u003e nebula emission lines, rejecting unwanted wavelengths and light pollution.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1356\" data-end=\"1589\"\u003e\n\u003cp data-start=\"1358\" data-end=\"1589\"\u003e\u003cstrong data-start=\"1358\" data-end=\"1402\"\u003eExceptional Contrast and Signal-to-Noise\u003c\/strong\u003e\u003cbr data-start=\"1402\" data-end=\"1405\"\u003eBy isolating the oxygen and sulfur signals, the filter produces a darker background sky and dramatically improves contrast—especially valuable in heavily light-polluted environments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1591\" data-end=\"1772\"\u003e\n\u003cp data-start=\"1593\" data-end=\"1772\"\u003e\u003cstrong data-start=\"1593\" data-end=\"1622\"\u003eLight-Pollution Resistant\u003c\/strong\u003e\u003cbr data-start=\"1622\" data-end=\"1625\"\u003eFilters out the vast majority of urban skyglow, allowing astrophotographers to capture clean, detailed nebula structure from almost any location.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1774\" data-end=\"1777\"\u003e\n\u003ch3 data-start=\"1779\" data-end=\"1801\"\u003e\u003cstrong data-start=\"1783\" data-end=\"1801\"\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1803\" data-end=\"2087\"\u003eL-Synergy is precision-engineered based on the spectral behaviour of emission nebulae and common light-pollution sources. Its carefully tuned passbands maintain consistently high transmission in both SII and OIII, ensuring accurate colour capture and high-quality data for processing.\u003c\/p\u003e\n\u003cp data-start=\"2089\" data-end=\"2302\"\u003eThe result: a powerful, easy-to-use narrowband solution that unlocks deep-sky imaging performance far beyond what typical colour cameras can achieve, giving more astrophotographers access to true SHO-style imaging.\u003c\/p\u003e\n\u003cp data-start=\"2089\" data-end=\"2302\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/lsyngy.jpg?v=1763165802\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":43990764322885,"sku":"OPT-LSYN","price":499.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/b6add4f4424b483367d04642ea35c4bd.jpg?v=1763166226"}],"url":"https:\/\/bintel.com.au\/collections\/eofy2026-optolong.oembed","provider":"The Binocular and Telescope Shop","version":"1.0","type":"link"}