ALP-T Dual Band 5nm Filter is best suited for optics f-ratios slower than f/3.6, the standard Antlia ALP-T Dual Band filter is highly recommended. Meanwhile, if you seek the best possible performance with any optics faster than f/2.2, the highspeed version is the best choice.
The Antlia ALP-T dual band 5nm series filter is a dual line-pass filter that was designed to be used primarily with one-shot color (OSC) cameras such as DSLR's and astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on our ALP-T ultra dual-band filter effectively isolate the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD) 4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.
The Antlia ALP-T Dual Band filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post-processing efforts to isolate faint details from the background light pollution.
Application and Performance:
Designed especially for optics, slower than f/3.6
Engineered specifically for use with DSLR, CMOS, and CCD color cameras
Suppression of optical density (OD) 4.5 on unwanted wavelengths adds signal-to-noise
Extremely steep bandpass edges minimize internal reflections
Ideal flat-top and moderate bandpass reducing spectrum downshifts
Ion Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter
Designed to suppress artificial lighting from Bortle scale 1 to Bortle scale 8
Near IR (NIR) is blocked up to 1050nm
Technical Specifications:
| Hydrogen-alpha | Oxygen III | |
| FWHM | 5nm | 5nm |
| CWL (Central Wavelength) | 657.8nm | 502.2nm |
| Peak Transmission | 88% | 82% |
| Blocking | ≥OD4.5 @ 300-1050nm | |
| Filter Thickness | 2mm+/-0.05mm | |
Filter Ring:
2'' (M48*0.75)
Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture
Black Anodized Finish
Laser Engraving No Fading
Spectrum Curve:
Not Recommended:
Solar imaging
Night visual observation
Not Permitted:
DO NOT LOOK AT THE SUN WITH THIS FILTER
Serious eye damage will result if you fail to observe the warning