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CGE Pro
Observatory-Class
Computerized
German Equatorial
Mount
The C20 Astrograph is a complete telescope system
featuring a revolutionary optical design that delivers
pinpoint stars across the entire field.
Goal: To design, engineer, and manufacture the finest
large aperture optical system possible for both imaging
and visual observation.
Achievement: The C20 Astrograph is the first telescope
system of its kind ever offered by a large commercial
telescope manufacturer.
After evaluating numerous design options, our
solution to the design of this instrument is a 20”
(
1
/2 meter) diameter f/6.8 coma-correct flat-field
Dall-Kirkham Cassegrain (corrected Dall-Kirkham)
optical assembly that is mounted on a newly designed,
massive CGE Pro observatory-class computerized German
Equatorial mount.
Revolutionary Optical System
Celestron’s Corrected Dall-Kirkham design exceeds the
off-axis performance of even the Ritchey-Chrétien design. RMS
spot sizes at the edge of a 35mm frame remain smaller than a single
pixel on the most advanced CCD cameras available to amateurs
today. The optical system also features a conical primary mirror with
low thermal mass and three cooling fans to minimize the cool down
time. This no-compromise design provides the superb resolving
power Dall-Kirkham telescopes are known for, but without the coma
and field curvature that has previously limited their wide-field
performance. Because of its flat-field design, you’ll find it a joy to use
for imaging as well as visual use. The C20 optical system will come
standard with Celestron’s advanced StarBright
®
XLT High
Performance Optical system.
The CGE Pro Mount
The tracking accuracy of this observatory-class mount is better than
5 arcseconds peak to valley without enabling the PEC function. The
C20 Astrograph mount separates into three components for easier
transporting and includes fully integrated electronics as well as
Celestron’s renowned and proven NexStar
®
software. It is also
supplied with NexRemote
®
Pro, a software package that creates
models of the mount which yields observatory class pointing
accuracy.
In A Class Of Its Own
Other telescopes that are in this premium category, such as the
Ritchey-Chrétien, cost many thousands of dollars more than a C20
and require that the optical tube, mount, and tripod be purchased
separately. In contrast, the C20 Astrograph is a complete package.
The C20 system includes the optical assembly, a carbon-fiber
truss system which minimizes refocusing due to temperature
changes, high performance computerized German Equatorial
mount, and professional class pier/tripod. The pier will be
available in both portable and permanent versions.
An Engineering Triumph
The C20 is without a doubt the most sophisticated
telescope that Celestron has ever designed and
manufactured. The C20 is a system that meets the
highest standards Celestron sets for technical
innovation, design and engineering superiority,
precision performance, and uncompromising optical quality.
We are now proud to offer our C20 OTA, CGE Pro Mount, CGE Pro
Tripod and CGE Pro Pier for sale separately.
21
C20 ASTROGRAPH
C20 • Dumbbell Nebula • Image courtesy of Richard Hedrick
C20 Astrograph
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