CELESTRON REDUCER/CORRECTOR F/6.3

This combination focal reducer and field corrector lens accessory works with all Celestron 5", 6", 8", 9 1/4", 11" and 14" Schmidt-Cassegrain telescopes. This clever accessory makes it possible to have a dual focal ratio instrument, without sacrificing image quality. The Reducer/Corrector is f/6.3 for C5, C6, C8, C9¼ and C11 telescopes and f/7 for the C14 telescope.

If offers wide fields of view with any Schmidt-Cassegrain telescope. Used for astrophotography, it reduces exposure time by a factor of 3.

Celestron doesn’t offer a f/6.3 Schmidt-Cassegrain telescope, because the design is impractical, with a large central obstruction, and resulting loss in contrast. This, added to the inability to utilize longer focal ratios for certain objects, led Celestron to design the four-element, fully multicoated f/6.3 Reducer/Corrector. Results are amazing both visually and photographically.

Produces a corrected field of 24mm diameter. The back focus is 105mm, from the reducer's back element to the camera's sensor

THE #94175 REDUCER/CORRECTOR LENS IS NOT COMPATIBLE WITH CELESTRON EDGEHD or MEADE ACF OPTICAL SYSTEMS.

Celestron’s new EdgeHD reducer Lens 0.7X features a custom 4 element optical design engineered to maintain the flat-field performance of our award winning EdgeHD optical system. Unlike generic reducers, our premium reducers provide substantial back focus to accommodate an assortment of imaging accessories.

EdgeHD reducers offer high index optical elements, including extra low dispersion, exotic Lanthanum elements, which provide high contrast viewing while minimizing chromatic aberration. All air to glass lens surfaces feature multiple layers of coating for maximum light transmission and color correction and contain blacken edges to minimize internal reflection and maximize image contrast.

Incorporating computer assisted CNC machined aluminum housing, for precise spacing and alignment of optical elements, and threaded metal covers on the lens assembly to protect your investment from dust and scratches, our reducers offer you an outstanding mechanical design.

With the Fastar option on all EdgeHD optical systems, coupled with the .7x reducer, your telescope becomes the most complete imaging system available in its price range today.

Reducer Lens 0.7X Performance

• Design: 4-element optical layout designed specifically for the EdgeHD 8" to maintain the flat-field performance of the Edge HD optical design
• 105mm of back focus: Provides generous back focus to accommodate additional accessories and a wide variety of cameras. Also allows use of existing T-adapters for EdgeHD 800 and other Celestron imaging accessories
• One full F-Stop faster than f/10: Reduces the exposure time by one-half to capture the same brightness of object
• Increase field of view by 43%: Better for capturing wide field images of larger galaxies and nebulae

Glass

• Lanthanum Glass Elements: EdgeHD reducer uses "rare earth" Lanthanum glass elements for clear, high contrast viewing while minimizing chromatic aberration
• Fully multi-coated lens elements: All air-to-glass surfaces have multiple layers of coating for maximum light transmission and color correction
• Blacken edges: All lens elements have blacken edges to minimize internal reflection and maximize contrast

Large Illuminated Field

• Optimized for APS-C sized sensors: Including most DSLR cameras and Nightscape CCD cameras

Mechanical Design

• Machined aluminum housing: Computer assisted CNC machined aluminum housing for precise spacing and alignment of the optical elements.
• Threaded metal covers for both ends of the lens assembly: To protect your investment from unwanted dust and scratches.

Versatility

• Provides and intermediate focal length between EdgeHD's native f/10 (or f/11) and the optional Hyperstar accessory at f/2, making the EdgeHD the most complete imaging system in its price range

Celestron’s EdgeHD reducers feature a custom 4-element optical design engineered to maintain the flat-field performance of our award winning EdgeHD optical system. Unlike generic reducers, our premium reducers provide substantial back focus to accommodate an assortment of imaging accessories.

EdgeHD reducers offer high index optical elements, including extra low dispersion, exotic Lanthanum elements, which provide high contrast viewing while minimizing chromatic aberration. All air to glass lens surfaces feature multiple layers of coating for maximum light transmission and color correction and contain blacken edges to minimize internal reflection and maximize image contrast. Large diameter lens elements, up to 60 mm clear aperture, ensure that the optimized image circle remains at a generous 42 mm for use with large CCD sensors.

Incorporating computer assisted CNC machined aluminum housing, for precise spacing and alignment of optical elements, and threaded metal covers on the lens assembly to protect your investment from dust and scratches, our reducers offer you an outstanding mechanical design.

With the fastar option on all EdgeHD optical systems, coupled with the .7x reducer, your telescope becomes the most complete imaging system available in its price range today.

Performance

Design: 4-element optical layout designed specifically for the EdgeHD 9.25" to maintain the flat-field performance of the EdgeHD optical design

Maintains the same back focus as when used at f/10: Unlike generic reducers the EdgeHD .7x provides generous back focus to accommodate additional accessories and a wide variety of cameras. Also allows use of existing EdgeHD T-Adapters and other Celestron imaging accessories

One full F-Stop faster than f/10: Reduces the exposure time by one-half to capture the same brightness of object

Increase field of view by 43%: Better for capturing wide field images of larger galaxies and nebulae

Glass

Lanthanum Glass Elements: EdgeHD reducer uses "rare earth" Lanthanum glass elements for clear, high contrast viewing while minimizing chromatic aberration

Fully multi-coated lens elements: All air-to-glass surfaces have multiple layers of coating for maximum light transmission and color correction

Blacken edges: All lens elements have blacken edges to minimize internal reflection and maximize contrast

Full Frame Design

Threads directly onto the 3.25" threads of the EdgeHD optical tube: Reduces mechanical vignetting and allows for use with larger (full frame) sensors and Off-Axis Guiders

Clear aperture: 60 mm clear aperture lens optimized for a 42 mm image circle for use with large CCD sensors.

Mechanical Design

Machined aluminum housing: Computer assisted CNC machined aluminum housing for precise spacing and alignment of the optical elements.

Threaded metal covers for both ends of the lens assembly: To protect your investment from unwanted dust and scratches.

Versatility

Fastar compatibility and f/2 imaging with optional accessory: the EdgeHD is the most complete imaging system in its price range.

High quality, fast refractors have a lot going for them when it comes to astrophotography but they come with a downside - field curvature. This is where the image comes to sharp focus on a curved surface. The problem is that the sensors in cameras are flat. The larger the sensor - like those used in cameras with APS-C sized or larger sensors or DSLR cameras - the more effect is noticed.

A field flattener brings the image to focus on a flat surface, like your camera's sensor. At the same time, the basic optical performance of your telescope remains the same.

You will need 55mm of backfocus.

The Bintel T-thread Spacer Ring Kit (sold separately) is recommended to achieve proper distance for use with CMOS imagers.

Use with a DSLR only requires a T-ring for the camera (T-ring sold separately).

0.85x Focal Reducer/Corrector for Sky-Watcher EVOSTAR ED72
Designed for serious Astro-Imagers. Optimized for the Sky-Watcher EVOSTAR ED72, this superb quality accessory effectively reduces the telescope’s focal length by a factor of 0.85x and provides much improved field-edge correction. Use in conjunction with Sky-watcher’s M48 Sony, Canon or Nikon T-ring adaptors. The optimal working distance from the M48x0.85 connection thread of the corrector is 55 mm.

Reduces an astrophotography refractor’s effective focal length by a factor of 0.8x, providing a shorter, more optically fast focal ratio.

Designed for use with any refractor telescope equipped with a 2″ focuser ,focal lengths between 400mm to 660mm and focal ratios of f/5 to f/7.5

Back focus required: 55mm of

Also flattens the field for sharper stars at the edge of the frame

Coatings: Fully multi-coated

Clear aperture: 38mm

Mounting: Threaded

Weight (gms): 175

Some of the most picturesque celestial objects are too large to fit in the field of view of an imaging refractor and camera. What’s more, most objects in deep space are very faint and therefore challenging to image without taking very long exposures, increasing the potential for error. 0.8x Focal Reducer for Refractors addresses these obstacles by increasing your refractor telescope’s field of view while reducing the effective focal length by a factor of 0.8x, thereby providing a shorter, more optically “fast” focal ratio to increase astrophotography efficiency. Using the 0.8x focal reducer not only enables your refractor telescope to acquire a larger field of view, but also makes it capable of capturing bright, vividly detailed astrophotos.

Celestron Reducer 0.7x Edge HD1100

Celestron’s new EdgeHD reducers feature a custom 5 element optical design engineered to maintain the flat-field performance of our award winning EdgeHD optical system. Unlike generic reducers, our premium reducers provide substantial back focus to accommodate an assortment of imaging accessories.

EdgeHD reducers offer high index optical elements, including extra low dispersion, exotic Lanthanum elements, which provide high contrast viewing while minimizing chromatic aberration. All air to glass lens surfaces feature multiple layers of coating for maximum light transmission and color correction and contain blacken edges to minimize internal reflection and maximize image contrast. Large diameter lens elements, up to 60 mm clear aperture, ensure that the optimized image circle remains at a generous 42 mm for use with large CCD sensors.

Incorporating computer assisted CNC machined aluminum housing, for precise spacing and alignment of optical elements, and threaded metal covers on the lens assembly to protect your investment from dust and scratches, our reducers offer you an outstanding mechanical design.

With the fastar option on all EdgeHD optical systems, coupled with the .7x reducer, your telescope becomes the most complete imaging system available in its price range today.

Performance

• Design: 5-element optical layout designed specifically for the EdgeHD11" to maintain the flat-field performance of the Edge HD optical design
• Maintains the same back focus as when used at F/10: Unlike generic reducers the EdgeHD .7x provides generous back focus to accommodate additional accessories and a wide variety of cameras. Also allows use of existing EdgeHD T-adapters and other Celestron imaging accessories
• One full F-Stop faster than f/10: Reduces the exposure time by one-half to capture the same brightness of object
• Increase field of view by 43%: Better for capturing wide field images of larger galaxies and nebulae

Glass

• Lanthanum Glass Elements: EdgeHD reducer uses "rare earth" Lanthanum glass elements for clear, high contrast viewing while minimizing chromatic aberration
• Fully multi-coated lens elements: All air-to-glass surfaces have multiple layers of coating for maximum light transmission and color correction
• Blacken edges: All lens elements have blacken edges to minimize internal reflection and maximize contrast

Full Frame Design

• Threads directly onto the 3.25" threads of the EdgeHD optical tube: Reduces mechanical vignetting and allows for use with larger (full frame) sensors and Off-Axis Guiders
• Clear aperture: 60mm clear aperture lens optimized for a 42 mm image circle for use with large CCD sensors.

Mechanical Design

• Machined aluminum housing: Computer assisted CNC machined aluminum housing for precise spacing and alignment of the optical elements.
• Threaded metal covers for both ends of the lens assembly: To protect your investment from unwanted dust and scratches.

Versatility

• Fastar compatibility and f/2 imaging with optional accessory: the EdgeHD is the most complete imaging system in its price range.
  

Instruction Manual

SkyWatcher F5 Coma Corrector is optimised for use with Sky-Watcher f/5 Newtonian reflecting telescopes, this field correcting lens provides flat pin point stars for both visual and astrophotography needs.

Take full advantage of your full-frame Digital SLR camera and produce superb flat field images without any increase or reduction in magnification.

The Sky-Watcher F5 Coma Corrector is to be used in conjunction with your cameras T-ring adaptor.

Can be used with most f/5 reflector that have a 2" focuser.

Requires 55mm back focus

Included with the Sky-Watcher F5 Coma Corrector:

• 2 ” Coma Corrector lens with T-thread male
• 2″ spacer
• 2″ eyepiece adaptor

Normally available for pickup or shipping approx. 2-3 business days from your order

SkyWatcher f4 Aplanatic Coma Corrector

Only for use with F4 Newtonian.

The Sky-Watcher 2” F4 Coma Corrector is designed to overcome the vignette effect that occurs in Newtonian telescopes. This allows you to see pin point stars across the whole field of view. Magnification remains the same. It helps astro-imagers improve their photos of the sky.

Its optimised for use in all Sky-watcher fast ratio (f/4) Newtonian Reflectors with 2” focusers. You’ll need to purchase the appropriate adaptors for connecting to your camera.

Sky-Watcher 2” Coma Corrector Features

• Coma Corrector (2″) for Newtonian Reflectors
• Optimised for all Sky-Watcher fast-ratio f/4 Newtonian Reflectors with 2″ focuser
• Delivers stunning wide-field views with pinpoint stars to the edge of the field (up to full frame sensors)
• Magnification remains unaltered

The length of the corrector is 100mm and it features an M48 male thread on the telescope side. Correct spacing from the corrector to your sensor is required for optimum correction:

F=600mm, working distance = 51.66mm
F=800mm, working distance = 53.66mm
F=1000mm, working distance = 55.0mm
F=1200mm, working distance = 54.66mm
> 1500mm, working distance = 54.60mm

0.9x thread-on reducer/corrector produces a flat field across the entire image while shortening exposure time by 24%. Optimized for Evolux 62mm refractors.

• 62mm, f/5.8, 360mm focal length
• 55mm back focus
• 30mm illuminated field
• Includes one ED element
• M56x1 female / M48 male threads
• Includes rotator/adapter with built-in cavity for 2-inch filters

Model TRF-2008 Tele Vue 0.8x Reducer/flattener 400-600mm converts TV-85 to 480mm f/5.6 and TV-76 to 380mm f/5.0 for flat field, fast photography. Fully multi-coated 3-element unit inserts directly into 2" focuser, accepts standard T-rings for 35mm cameras. Whilst designed for use in the TV-76 and TV-85, it can be used with other fast refractors between 400mm and 600mm focal length.

Used in prime-focus imaging, reducers increase photographic speed while flatteners decrease image curvature away from the center.

Important Note: The following products were all designed for an optimum 55mm back focus. (Distance from flange surface to film or CCD plane). If you use a CCD, be sure the spacing between flange and CCD is 56mm +/-2mm for best results.

"This accessory is a must-have for someone planning to use the TV-85 photographically" - review in Sky & Telescope, July 1999. Also it can be used with any 400-600mm refractor.

OPTEC Lepus .62x Telecompressor is optimized for 100mm of distance between the last lens surface and the image plane. Measured from the telecompressor flange, this distance works out to 105mm. Assuming a native focal ratio of f/10, the Lepus 0.62X will reduce the effective focal ratio to approximately f/6.2. Shifting the image plane outward will provide additional reduction but a loss of star quality at the edge of the images. The optimal distance for most SCT's is 100mm with the exception of the C9.25 EdgeHD SCT.

Standard Edition Lepus 0.62X telecompressor lens designed for use with any telescope having the TCF-S or other 2-inch focuser in place. Works well with Meade ACF f/10 and f/8 coma-free SCT telescopes. The Lepus 0.62X Standard Edition is housed in a 2-inch barrel-like assembly and will fit into any telescope receiver for standard 2-inch eyepieces.

The camera side connection for the Lepus 0.62X telecompressor is a broad dovetail known as the OPTEC-2100. The proper back-focus distance to the camera image plane is maintained with Optec's custom camera-specific Lepus mounts available separately below. The OPTEC-2100 interface also allows easy connection to the Pyxis 2" rotator in place of the standard 2-inch nosepiece. When connected to the camera, Lepus will appear as a long 2-inch nosepiece that fits into any 2-inch focuser or eyepiece receiver.

Special DSLR adapters are available from stock for Canon and Nikon cameras which hold and maintain the 100mm on-axis back-focus distance.

The Lepus can be used with other telescope designs but is not parfocal. Therefore, some re-focusing will be required. Performance is not guaranteed with all telescope optical designs and the Lepus is not recommended for use with Ritchey-Chretien telescopes.

OPTEC_Lepus_Backfocus

OPTEC Camera Spacers

A reducer has the optical property of decreasing the effective focal length of a telescope. This results in a wider-field and faster imaging time on nebulae and galaxies. Model NPR-2073 0.8x Reducer for NP Scopes is specifically designed to be used with the NP127is and NP101is. While it can also be used to enlarge the field of other Tele Vue Petzval type telescopes, it will not provide additional correction for those models.

This reducer was designed to minimize vignetting with camera sensors up to 43mm diagonal (Full Frame) and is a replacement for the previous 0.8x reducer, the NPR-1073, which worked best up to APS-C sensors. When combined with a Tele Vue Petzval type telescope, it reduces the focal length of the telescope by 20% and makes it that much faster. This increases the telescope's field of view by 25%.

For use on other Tele Vue Petzval model telescopes with 2-inch focusers, use the RAD-1074 Imaging System Nosepiece for 2" Focuser instead of the I.S. Imaging Adapter. Note that when used with 2" focusers there will be increased vignetting for full frame sensors because of the inner diameter of the 2-inch barrel.

This reducer requires the Imaging System insert to attach to the drawtube and Imaging System rings to attach to your accessories and camera.

SKU: NPR-2073

Instruction Manual

Tele Vue 0.8x Reducer/Flattener RFL-4087

TV-102 and TV-102is

Model FL-4087 Tele Vue 0.8x Reducer/flattener TV102 is a 0.8x Reducer/Flattener for TV-102 and TV-102is scopes and any 800-1000mm focal length refractor for imaging with up to 35mm camera formats. For TV-102 (non-"is") it requires the RAD-1074 Reducer Body Adapter for 2" focusers.

This reducer/flattener requires Imaging System camera adapter such as CWT-2070 (Canon Wide T-Adapter with Bayonet for 2.4" Focusers), STL-1071 (SBIG STL Camera Adapter), or TRG-1072 (Standard T-Ring Adapter) to connect to camera.

Looking for a corrector for the Tele Vue 101is/127is? Check out the Tele Vue Large Field Corrector.

• Optimised for the Sky-Watcher Esprit 70EDX
• Reduces the telescopes focal length by a factor of 0.92x
• Provides much improved field-edge correction

Sky-Watcher 0.92x Reducer for Esprit 70EDX

Designed for serious astrophotographers. Optimised for the Sky-Watcher Esprit 70EDX. They effectively reduce the telescopes focal length by a factor of 0.92x and provide much improved field edge correction.

Sky-Watcher 0.85x Focal Reducer/Flattener For 80/100/120/150ED DS-PRO

Designed for serious astro-photographers. Each model is optimised for the corresponding model in the Sky-Watcher Evostar-ED DS-Pro range. They effectively reduce the telescopes focal length by a factor of 0.85x and provide much improved field edge correction. You will need to use a Sky-Watcher DSLR-M48 Ring Adaptor to connect this to your telescope. As always, try to make sure you’re the telescope and tripod you’re using can support the weight of your camera.

Available Models:

• 80ED
• 100ED
• 120ED
• 150ED

Field flattener for Sky-Watcher 150ED and 150EDX APO model telescopes

ZWO has released a new 3-inch FF80APO 0.76X full frame reducer with a three-element optical design, including one element made of ED glass. Its reduction factor is 0.76x, which gives the FF80APO f/7.5 astrograph a shortened focal ratio of f/5.7 and a shorter focal length of 312mm. This allows for less total integration time and a wider field of view, bringing more convenience and possibilities for your wide-field deep sky imaging.

The reducer has a rear interface that attaches to the FF80APO telescope tubes included four-segment camera extension tube. The back focus is the standard 55mm, and it has a built-in M48X0.75 2-inch filter thread for easy attachment.

Connection steps:

1. Prepare the FF80APO telescope tube and the focal reducer.
2. Unscrew the four-segment connector at the end of the FF80APO telescope tube.
3. Unscrew the end cap of the 0.76X reducer and attach it to the M68 thread of the four-segment connector.
4. Unscrew the front cap of the reducer, insert it into the focuser inner tube, and tighten it.

ZWO has released a brand-new FF65APO 0.75× full frame reducer with a four-element optical design. It has a reduction factor of 0.75x, which gives the FF65APO f/6.4 astrograph a shortened focal ratio of f/4.8 and a shorter focal length of 312mm. This allows for less total integration time and a wider field of view, bringing more convenience and possibilities for your wide-field deep sky imaging. The back focus distance is the standard 55mm. It also comes with two thread adapters of M54 and M48, and a built-in M48x0.75 2” filter thread, which makes the connection work simple and convenient.

Connection steps:

1. Prepare the FF65APO telescope tube and the focal reducer.
2. Unscrew the eyepiece holder at the end of the FF65APO telescope tube.
3. Unscrew the end cap of the 0.75X reducer.
4. Insert the reducer into the focuser and tighten.

0.9x thread-on reducer/corrector produces a flat field across the entire image while shortening exposure time by 24%. Optimized for Evolux 82mm refractors.

• 82mm, f/5.8, 477mm focal length
• 55mm back focus
• 36mm illuminated field
• Includes one ED element
• M56x1 female / M48 male threads
• Includes rotator/adapter with built-in cavity for 2-inch filters

This camera adapter for the Optec Lepus focal reducer is 50mm long and features a male M42 x 0.75mm T-thread making it suitable for any camera with 55mm depth-to-sensor or "flange focal distance". This adapter is equivalent to #19392-47.

Add a T-ring to mate with Canon, Nikon, or other DSLR or mirror-less cameras.

Field flattener for Sky-Watcher 100ED and 100EDX APO model telescopes

ZWO has released a new 3-inch 0.7× full frame reducer that is compatible with the FF107APO and FF130APO telescopes. It has a three-element optical design, including one element made of ED glass. Its reduction factor is 0.7, which gives the FF107APO a shortened focal ratio of f/4.9 and a shorter focal length of 524mm. This allows for less total integration time and a wider field of view, bringing more convenience and possibilities for your wide-field deep sky imaging.

The reducer has a standard 55mm back focus and comes with M68, M54, and M48 threaded adapters for easy attachment.

Connection steps:

1. Prepare the FF107APO/FF130APO telescope tube and the focal reducer.
2. Unscrew the M86 to 2-inch adapter at the end of the FF107APO telescope tube.
3. Unscrew the end cap of the 0.7X reducer.
4. Insert the reducer into the focuser inner tube and tighten it.

• 36mm fully illuminated field, compatible with both APS-C and full frame sensors
• 90mm back-focus (55mm when back focus spacer and M48 ring installed)
• Drops f/ratio from native f/7 (1050mm) to f/5.4 (810mm)
• Reduces exposure time by 68% compared to native f/7
• 2.54 x 1.7-degree field of view when used with a full frame camera
• 1.66 x 1.11-degree field of view when used with APS-C crop sensor
• Includes reducer, metal thread-on caps, back focus spacer and M48 thread adapter
• Built-in 2" filter cell for mounting filters into the light path

Tele Vue BIG Paracorr - Type 2 (3inch)

Tele Vue's 3" BIG Paracorr Type-2, designed by Paul Dellechiaie, extends the Paracorr type 2's optical benefits for imaging applications by amateurs and professionals using CCD formats as large as 52mm diagonal and paraboloids as fast as f/3. Back focal length has been extended to 80mm to allow for additional accessories to be placed in the optical path. The 5.1" length optical assembly is topped with a "stop" flange having 3.40"-24 pitch threads to mount camera adapters and spacer tubes (available later).

Paracorr Eats Coma

Paracorr can be used with both 2" and 1¼" eyepieces. For visual use, slip Paracorr Type-2 into your focuser like a Barlow lens, and your eyepiece into Paracorr. (3" BIG Paracorr Type-2 requires adapter and tunable top for visual use). 1¼" eyepieces will make use of Paracorr's special low profile 1¼" reducing adapter. Paracorr is threaded for 2" filters.