Celestron 8" EdgeHD OTA with Dedicated Focal Reducer - Save $$$

Save 5% on this Celestron EdgeHD Bundle! You'll get the EdgeHD 800 OTA (91030-XLT) and it's dedicated .7X Reducer (94242)! These two quality optical systems go together like peanut butter & chocolate, and will defintely up your astrophotography game! Buy now while supplies last and SAVE!

The EdgeHD is an aplanatic Schmidt Celestron Telescope designed to produce aberration-free images across a wide visual and photographic field of view. The optical system was designed to reduce more than just off-axis star coma, but also to give an astrograph quality flat focal plane all the way to the edge of the field of view.

True Astrograph Quality - Many optical designs that advertise themselves as "astrograph" quality actually only produce pinpoint stars across a curved focal plane. While this may be acceptable for visual observing, stars will appear out of focus at the edge when used with a flat chip sensor of a digital camera. Celestron EdgeHD optics produce a focal plane more than three-times flatter than a standard Schmidt Cassegrain telescope and dramatically flatter than other competing coma-free designs. This guarantees you visibly sharp stars across some of the largest CCD chips available today.

Improved Performance - Superior edge performance not only creates rounder, more pleasing stars but actually improves the resolution and limiting magnitude when compared to telescopes of equal aperture. Celestron Starbright XLT Coatings coupled with Celestron's StarBright XLT coating group on every surface, EdgeHD optics gives you maximum light throughput across the widest visual and photographic spectrum.

Mechanical Features - In addition to Celestron's new optimized optical design, the EdgeHD tube has been redesigned to make sure you get the most from your optics each and every night.

Mirror Clutches - Flexible tension clutches hold the mirror in place and reduce image shift when rotating the tube around the mount. The flexible rods allow the mirror to be held in place without putting any force or pressure on the mirror assembly, keeping the image centered in the eyepiece (or chip).

Tube Vents - Cooling vents located on the rear cell allow hot air to be released from behind the primary mirror. Each vent has an integrated 60 micron micro-mesh filter guaranteed to let warm air out without letting dust in.

Fastar Versatility - The EdgeHD is the most versatile imaging available today. At its native f/10 you can achieve the image scale necessary to capture the smallest of deep sky objects. With the optional reducer lens (coming soon) you can increase your field of view without sacrificing optical performance. A barlow gives you the added power for high resolution planetary, lunar and solar imaging. And of course all EdgeHD optical tubes are Fastar compatible for ultra fast f/2 wide field imaging. Each tube has been fitted with a removable secondary mirror and are opto-mechanically aligned on a laser bench to ensure they are axially symmetric in any configuration.

• 8" EdgeHD Optical Tube Assembly

   

• Aluminum Optical Tube

   

• Celestron premium StarBright XLT coatings

   

• 2032 mm focal length (f/10)

   

• 40 mm eyepiece included (51x)

   

• Visual back allows for use with 1.25" accessories

   

• 9x50 finderscope to help accurately find objects

   

• Star diagonal provides more comfortable viewing position when observing objects that are high in the sky

   

• Mirror Support Knobs hold the mirror in place and reduces image shift during imaging.

   

• Tube vents with integrated 60 micron mesh filter allowing hot air to be released from behind the primary mirror.

   

• Fastar Compatible optical tubes are equipped with a removable secondary mirror for fast f/2 ccd imaging

   

• Includes dovetail rail compatible with CGE mount

Optical Design: EdgeHD

Aperture (mm): 203.2 mm (8 in)

Focal Length (mm): 2032 mm (80 in)

Focal Ratio: f/10

Eyepiece 1 (mm): 40 mm (1.57 in)

Magnification 1: 51 x

Finderscope: 9x50

Star Diagonal: 1.25

Optical Tube: Aluminum

Highest Useful Magnification: 480 x

Lowest Useful Magnification: 29 x

Limiting Stellar Magnitude: 14

Resolution (Rayleigh): 0.69 arc seconds

Resolution (Dawes): 0.57 arc seconds

Light Gathering Power (Compared to human eye): 843 x

Secondary Mirror Obstruction: 2.7 in (69 mm)

Secondary Mirror Obstruction by Diameter: 34 %

Secondary Mirror Obstruction by Area: 11 %

Optical Coatings: StarBright XLT

Optical Tube Length: 17 in (432 mm)

Optical Tube Weight: 14 lbs (6.35 kg)

Dovetail Compatibility: CGE Mount

Celestron Product Number: 91030-XLT

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

Celestron 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, Celestron 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.

Design: 5-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

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

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

Full Frame Design: Optimized for APS-C sized sensors: Including most DSLR cameras and CMOS cameras

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

• The EdgeHD .7x Focal Reducer Lens makes your EdgeHD 800 one full f-stop faster than f/10, doubling the equivalent exposure at f/10

   

• 4-element lens design

   

• Maintains similar flat-field performance as native EdgeHD optical design

   

• Increases field of view by 43% (double by area) to better capture wide field images

   

• Optimized for APS-C sized sensors, including most DSLR cameras and CMOS cameras

   

• Provides generous 105mm back focus to acommodate additional accessories and a wide variety of cameras

   

• Compatible with EdgeHD 800 T-adapter

Design: 5-Element

Compression Factor: .7 x

Optical Coatings: Fully multi-coated

Optimal Back Focus (mm): 105 mm (4.13 in)

Weight (lbs): 0.8 lbs (0.36 kg)

Celestron Product Number: 94242