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Basic Information about the CGEM Series

In December of 2008, Celestron introduced a new line of computerized scopes - the CGEM Series.  CGEM is a step up on capacity and stability from the Advanced Series with GoTo (AS-GT) - positioning it between the AS-GT and CGE in price and capabilities.  Utilizing a NexStar hand control, the CGEM series consists of a German equatorial mount (GEM) on a steel-legged tripod.  The series includes 8, 9 1/4 and 11 inch SCT models.  The mount is also sold without an optical tube.

The computerized hand control is a version of the NexStar hand control with the latest GEM-specific firmware.  This hand control responds to the same PC commands (via the RS-232 port on the bottom) as other NexStar-driven scopes and thus could be used with any program offering a setting for the NexStar GPS, for example.  The mount includes a real-time clock to keep the date/time settings required for alignment and can also use the CN-16 GPS module for precise time and location information.  The mount also includes a standard autoguider port.

The CGEM series provides a very portable and stable platform for a wide variety of optical tubes. It is an excellent platform for both visual and photographic work.  For those looking for a more stable astrophotography platform, particularly for imaging with a larger SCT optical tube, the CGEM is recommend over the AS-GT.

Following are the basic statistics for the series:

 

CGEM 800

CGEM 925

CGEM 1100

Aperture

8" (203mm)

9.25" (235mm)

11" (279mm)

Focal Length

2032mm

2350mm

2800mm

Focal Ratio

f/10

f/10

f/10

Eyepiece

25mm Plössl

25mm Plössl

40mm Plössl

Max Mag

400x

470x

550x

Max FOV

0.9°

0.74°

0.6°

Magnitude Limit

13.3

13.5

14

Resolution Limit

0.7 arcsec

0.6 arcsec

0.5 arcsec

Finder

6x30

6x30

9x50

Weight

88 lbs.
(40 kg)

113 lbs.
(51.4 kg)

120 lbs.
(54.5 kg)

Additional information is found on Celestron's web site (www.celestron.com).


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