Skies Unlimited Logo
Real Observers - Honest Advice
Andromeda Galaxy image by Frank Colosimo Crab Nebula image by Christoper Abissi Hercules Cluster image by Frank Colosimo
(888) 947-2673
Welcome, Guest User :: Login :: Signup      Items: 12 :: Subtotal: $51,131.85 :: View Cart
Celestron CGE Pro 925 HD

The CGE Pro 925 HD features Celestron's Aplanatic Schmidt-Cassegrain optical system with built in field flattener, producing pinpoint star images all the way to the edge of the field. Some optical systems currently on the market may produce coma free images. But there is a difference.

Item #ProductStock StatusPriceShipping
11092Celestron CGE Pro 925 HDAvailable June 2010 
Accepting Pre-Orders This is a newly announced item that will be available shortly. You may pre-order now to be among the first to receive it. No charge will be placed upon your credit card until your order is shipped.
$5,099.00Get Shipping Quote
Celestron CGE Pro 925 HD Aplanatic Schmidt-Cassegrain Telescope

Celestron CGE Pro 925 HD

The Optical Difference

Not only is the EdgeHD coma free, but it also has a built-in field flattener to ensure sharp focus all the way to the edge of the field, producing true Astrograph quality images. This results in pinpoint, High Definition star images throughout your astro photograph.

New Mechanical Design Features

Mirror Support Knobs - Flexible tension clutches hold the mirror in place and reduce image shift when rotating the tube around on the mount.

Tube Vents - Cooling vents located on the rear cell allow hot air to be released from behind the primary mirror.

Fastar Versatility - All EdgeHD optical tubes are Fastar compatible for imaging down to f/2 with optional accessories.

Brighter Star Images - Light becomes more concentrated when focused precisely. This maximizes image brightness.

These superior features combined with the recently announced CGE Pro and CGEM mounts makes the EdgeHD series the new gold standard in Astro imaging.

Back to List

Optical Specifications: Celestron CGE Pro 925 HD
Type Aplanatic Schmidt-Cassegrain
Aperture (mm) 235 mm
Aperture (in.) 9.25 inches
Focal Length 2350 mm
Focal Ratio f/10
Limiting Visual Stellar Magnitude <p><b>Limiting Stellar Magnitude</b><br /> This is a measure of the faintest star that can be seen with a telescope under ideal conditions. We include this figure for the purpose of comparing two telescopes of different apertures using a consistent scale. Many manufactures publish this specification. Unfortunately manufactures use different methods to calculate this figure, rendering the numbers useless for direct head to head comparison of different brands of telescopes. </p> <p>Limiting stellar magnitude is the sum of the naked eye limiting magnitude and the telescopic gain. The naked eye limiting magnitude varies by location due to local light pollution; therefore, it is an assumption. This figure could be 6.5 or higher at some of the darkest locations, but less than 2 in the middle of a large city. Our calculations assume a figure of 5, which one might typically find 30-40 miles from a major urban area. </p> <p>Telescopic gain is a direct function of aperture. No attempt has been made to compensate for the affects of central obstructions or different types of optical coatings.</p> 14.5 Magnitude
Accessories and Features
Go-To System Celestron NexStar system with 40,000+ object library. Flash upgradeable via the Internet.
Star Diagonal Two-inch mirror type w/1.25-inch eyepiece adapter
Accepts 2" Eyepieces <p><b>Telescope Eyepiece Formats</b><br /> Virtually all telescope eyepieces available today conform to one of two barrel diameter standards: 1.25 or 2 inches. Most amateur astronomers will be perfectly content with 1.25" eyepieces. Two-inch eyepieces have only one inherent advantage. That advantage is a potentially larger field of view, but not every telescope can take advantage of that potential. </p> <p>A Telescope and eyepiece work together to collect parallel light rays over a large area, compress those light rays down into a smaller area, and the re-orient them so that they are nearly parallel once again. Essentially light arriving at a telescope with any given aperture is compressed into a smaller aperture or exit pupil. The ratio of the telescope aperture to eyepiece exit pupil determines the magnification.</p> <p>There are cases at very low magnifications where the eyepiece barrel diameter becomes the constraint on maximum field of view. The eyepiece barrel itself actually blocks some of the available light that the telescope is collecting, thus limiting the field of view. Two-inch eyepieces overcome this constrain by allowing a larger light cone to enter the eyepiece. We must conclude this discussion by restating that 2" eyepieces have no inherent advantage over 1.25" eyepieces other than the potential for a larger field of view when used with a telescope capable of benefiting from that advantage. </p> Yes
Physical Parameters
Tripod Weight 52 Pounds
Weight, Optical Tube 21 Pounds
Weight, Mount 75 Pounds
Weight, Fully Assembled 175 Pounds
Counterweights 1 x 22 Lb.
Optical Tube Length 22 Inches
Power Requirements 5 amps at 12 VDC
Eyepiece Calculator
Enter your eyepiece's specifications:
Focal Length (mm):
Apparent Field (deg.):
 
Magnification:
 
True Field:
 
Exit Pupil: <p>Exit pupil represents the diameter of the column of light exiting the eyepiece. Magnification is simply the ratio of telescope aperture to exit pupil. Fox example, using a telescope with 100mm aperture and an exit pupil of 2mm yields a magnification of 50X.</p> <p>There are both upper and lower limits to the useful range of exit pupils. The typical human eye pupil dilates to a maximum of 7mm when fully dark adapted. This figure decreases with age. Using an exit pupil that is larger than this upper limit simply spills the light onto an area of the eye not capable of receiving data. At the opposite end of the range, a smaller exit pupil means less area on the eye is collecting data. Images brightness decreases with decreasing exit pupil. Deep space objects grow dimmer rapidly as the exit pupil falls below 1 mm. The planets also start to become noticeably dimmer when the exit pupil falls much below 0.5 mm.</p> <p>Our eyepiece calculator provides warnings and error messages based upon the value of the exit pupil. These are intended to be guidelines as opposed to hard rules. There is no harm in violating these gidelines, but your enjoyment of the telescope may be diminished if you do. </p>