Celestron - 8" EdgeHD Telescope with CGEM II Mount (CGEMII) - 12017

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Celestron's 8" EdgeHD meets the updated and more ergonomically designed CGEM II mount. The EdgeHD optical system takes all of the compact power popularized by the SCT and combines it with an improved high definition optical system for wide field, astrograph quality images.

SKU: CEL-12017
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Product Description

Celestron 8" EdgeHD Telescope with CGEMII EQ Mount

Celestron's EdgeHD optics takes the Schmidt-Cassegrain (SCT) system and minimizes the coma at the edge of the field of view, making the optics  suitable for very professional high-end astrophotography. When coma occurs, stars at the edge of the field of view don't appear as razor sharp as those in the center. The EdgeHD ensures that high definition pinpointed images are not only in the center, but at the very edges as well.  Aplanatic Schmidt-Cassegrain optical system. This compound, or catadioptric, light-path employs a combination of mirrors and lenses that offer a large, high-resolution aperture, a shorter tube length, and enhanced portability. Since this is a catadioptric design, therefore using mirrors and corrective plates, taking aspects from both reflectors and refractors, telescopes like the EdgeHD 800 naturally result in having a slower focal ratio of f/10, which is excellent for viewing or imaging planets or any other objects with high surface brightnesses at smaller fields of view. Celestron's built in Fastar system uses a removable secondary mirror to transform the optical tube into a f/2 focal ratio which is outstanding for deep sky observing! With a fast focal ratio like this, the EdgeHD 800 can accommodate very large CCD chips because it allows for bigger pixel size without as much chance of blooming and allows much shorter exposure times.


  • Coma eliminated with EdgeHD optics
  • StarBright XLT Coatings
  • 8" Aperture
  • Focal ratio of f/10
  • Fastar focal ratio of f/2
  • 9x50 finderscope
  • 1.25" diagonal
  • 40mm eyepiece
  • 1.25" visual back
  • Dovetail slide bar for CGE




Celestron - CGEM II Equatorial Mount

Celestron has updated the ever popular CGEM mount.  The Celestron CGEM II equatorial mount includes new ergonomic design features, the All Star alignment procedure, and legendary Celestron mount performance.  An instrument capacity of up to 40 pounds allows this mount to carry an 11" optical tube with ease.  

The CGEM II includes extra large Altitude and Azimuth adjustment knobs so you can polar align easily, even in cold weather while wearing gloves. A dual saddle plate will accept both V and D series dovetails. Internal mount wiring keeps the exterior of your mount free from cables and prevents cable tangling or wrapping. Celestron's AllStar polar alignment procedure allows you to use any star in the night sky whether the celestial pole can be seen or not.  The results are accurate polar alignment, tracking, and pointing.  The Celestron CGEM II will track far beyond the meridian for uninterrupted tracking.  Permanent Periodic Error Correction (PEC) will train the mount's worm gears over time to remove natural errors that occur during tracking.  

Included with the Celestron CGEMII is a USB hand controller with over 40,000 objects and 100 user-defined objects plus enhanced information on over 200 objects.  The mount's tripod include height marked adjustable legs so you can quickly setup.   If you were considering a Celestron AVX mount but worried it would be too lightweight, the CGEM II is a perfect fit providing a stable base for larger optical tubes and heavier imaging systems.  


Name Celestron - 8" EdgeHD Telescope with CGEM II Mount (CGEMII) - 12017
Manufacturer Celestron
Model CEL-12017
UPC 050234120173
In The Box Celestron 8" EdgeHD Optical Tube Assembly Dovetail CGEMII Mount Head Height Marked Tripod Accessory Tray USB Hand Controller
Aperture 203.2 mm (8 in)
Dovetail Compatibility CGE Mount
Eyepiece 1 40 mm (1.57 in)
Finderscope 9x50
Focal Length 2032 mm (80 in)
Focal Ratio 10
Optical Tube Aluminum
Optical Tube Length 17 in (431.8 mm)
Optical Tube Weight 14 lbs (6.35 kg)
Secondary Mirror Obstruction 2.7 in (68.58 mm)
Secondary Mirror Obstruction by Area 11.4 %
Secondary Mirror Obstruction by Diameter 33.8 %
Star Diagonal 1.25


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Review by:
I purchased this telscope package with the Starscense system from Woodland hills a few years ago. My first telescope in well over 30 years. WOW I can't say how much I love this telescope. As a kid my parents had purchased a Jason telescope for my birthday and when I saw Saturn, my love of the night sky began. Fast forward 30 years, new technology go to computerized systems I can find an object quickly and spend my nights viewing rather than searching. The folks at Woodland hills are great. Every item I've order from them comes in perfect condition and on time. Any question I've had on equipment operation has been answered promptly by phone call or online messaging. (Posted on 4/6/2019)
Review by:
i bought this edge hd telescope, it took 5 months until i had it, it was a problem with the carrier that i chose since i live in another country.
but the woodland hills sent it too fast to that address (about a week).
so, after i got it and used it ( i give 5 stars regarding that delay from the carrier i chose-the blame on me in this one).
and by the way , anyone wants to buy this teleacope and cgem ii mount, it does not come with polar scope, you have to buy it separately (Posted on 12/4/2017)
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In the Box

Celestron 8" EdgeHD Optical Tube Assembly
CGEMII Mount Head
Height Marked Tripod
Accessory Tray
USB Hand Controller

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