In addition to being fully computerized with a database of over
40,000 celestial objects, the New CGE Pro German Equatorial mount has
been completely redesigned to offer numerous design advantages for the
Increased Payload Capacity
to hold our 14" SCT telescope more securely as well as larger optical
tubes up to a maximum instrument capacity of 90 lbs (not including
All-Star Polar Alignment
any bright alignment star for a software assisted alignment of the
mount's polar axis that will have you ready for imaging even if you
can't see the North Star.
No-Tool polar alignment
Larger hand knobs for both Altitude and Azimuth adjustments.
Extended tracking past the Meridian of up to 20 degrees of uninterrupted imaging through the best part of the sky.
Faster slew speed
Improved gearing and motors provide faster slew speeds than ever before with a maximum slew rate of over 5°/per second.
electronics deliver constant regulated power to the motors making them
capable of driving the telescope even when not perfectly balanced. This
allows the CGE Pro to have the payload capacity of that of much larger
(and expensive) mounts without sacrificing smooth tracking motion and
pointing accuracy across the entire sky.
hallmark of any telescope mount is its ability to find, center and
track celestial objects with the highest degree of accuracy. The CGE Pro
provides the precision pointing and tracking accuracy needed for
demanding visual and imaging pursuits.
With just a
standard hand control alignment, the CGE Pro has the ability to center a
star in your eyepiece or CCD chip to within 5 arc minutes. Using
NexStar's advanced pointing features such as Calibration Stars, Sync and
Precise GoTo, further improves the pointing accuracy to as low as 1 arc
minute in the desired region of the sky.
With larger .75"
pitch diameter worm gear and 6" pitch diameter worm wheel, precision
made cut-steel gears in gearboxes, and seven slot-skewed armature
motors, the CGE Pro delivers smooth +/- 5 arc second tracking accuracy
typical unguided periodic error, which can be further reduced with PPEC.
NexStar hand control has built-in compensation features essential for
accurately placing small objects on the center of your CCD chip or high
power eyepiece. Aligning on multiple Calibration Stars creates a model
of the opto-mechanical inaccuracies inherent in all equatorial mounts.
This model is stored within the hand control and is used to compensate
for these inaccuracies, thus improving your pointing precision each time
you slew your telescope.)
NexStar hand control has built-in mount modeling features essential for
accurately placing small objects on the center of your CCD chip or high
power eyepiece. Aligning on multiple Calibration Stars creates a
mathematical model of the opto-mechanical inaccuracies inherent in all
equatorial mounts. This model is stored within the hand control and is
used to compensate for these inaccuracies, thus improving your pointing
precision each time you slew your telescope.
And of course, the CGE Pro is also fully T-Point compatible
(available from Software Bisque) for ultra precise pointing across the
In addition to these improvements, the Celestron line of German
Equatorial mounts has long been recognized for features preferred by
visual observers and astrophotographer alike. Among them include:
Portability - Set up and
transportation of the CGE Pro telescopes is made easy by separating the
mount into smaller, easy-to-carry components. Unlike fork arm mounted
telescopes, the CGE's optical tubes can be quickly removed from their
mounts making even the CGE Pro1400 easily assembled in minutes.
Stability - Recognized for
superior stability, German Equatorial mounts place the center of gravity
directly over the tripod legs and can be easily polar aligned without
the use of an optional equatorial wedge. This proven design reduces the
"tuning fork" vibration that can be associated with undersized fork
mounts. An improved Super HD Tripod supports the CGE Pro mount. This
fully extendable tripod is made from the finest 2.75" stainless steel
and can be raised to a height of 55". The tripod uses a dual leg support
for maximum rigidity with an upper leg brace to provide an outward
preload and a lower leg brace providing inward tension.
Balance - CGE Pro Equatorial
mounts can easily be balanced in both axes. Simply sliding the
counterweight for Right Ascension and moving the optical tube along its
dovetail mounting for Declination, accomplish balancing the weight of
camera equipment and other visual accessories. This means that no
additional weight needs to be added to balance the telescope when
additional accessories are added.
Clearance - CGE Pro mounts
support their tubes at a single contact point allowing the tube to move
freely around its polar axis without making contact with the telescope's
mount. Software features allow the user to set the mounts slew limits
to guaranty safe motion. This is particularly useful when adding
photographic and CCD instruments that extend from the rear of the
All CGE mounted telescopes are compatible with Celestron's SkySync
GPS accessory. Combine the GPS and built-in real time clock, and these
telescopes will keep track and remember their exact location and time
without having to enter the information into the hand control.
CGE PRO Tracking Data
The following graphs display R.A. worm gear tracking accuracy of the
CGE Pro Equatorial mount in 4 conditions: Figure 1 – Raw unguided
tracking that isolates the periodic error; Figure 2 – Tracking with
Permanent Periodic Error Correction (PPEC) enabled; Figure 3 – Guided
tracking with an autoguider; and Figure 4 – Guided tracking with an
autoguider and PPEC enabled. Data was acquired from Celestron’s
engineering team using an EdgeHD 800 optical tube and NexImage camera at
f/10. This data represents the typical performance of a CGE Pro under
average seeing conditions from urban skies in Torrance, CA. Figure 2 has
a cubic fit applied to the graph, and Figures 1, 3 and 4 have linear
drift removed (to better show repeatable error). All Figures show 22
minutes of tracking, which covers 4 full rotations of the CGE Pro R.A.
Figure 1. This graph displays the R.A. worm gear tracking accuracy
for a typical CGE Pro equatorial mount. The graph shows 4 periods of the
worm gear which yields about +/-7 arc seconds of periodic error. The
minimal periodic error is both very predictable and gradual, allowing
short unguided images to be taken, or much longer exposures with
extremely accurate tracking when used with an autoguider.
Figure 2. With the CGE Pro’s Permanent Periodic Error Correction
(PPEC) enabled, most of the periodic error is eliminated, leaving behind
lesser tracking errors caused by atmospheric turbulence, wind, and
opto-mechanical flexure. PPEC brings the CGE Pro’s R.A. tracking
accuracy to about +/-2 arc seconds, allowing even longer unguided
exposures (for uses like Hyperstar imaging).
Figure 3. Autoguiding with the CGE Pro provides consistent tracking
accuracy to within +/-2 arc seconds under average seeing conditions.
Autoguiding provides an easy way to sustain long-exposure astro-images
without excessive tracking error or drift.
Figure 4. With autoguiding and PPEC enabled, we can take full
advantage of the CGE Pro’s stability and tracking accuracy. Even under
average seeing conditions, PPEC + autoguiding easily yields tracking
accuracy of less than +/-2 arc seconds. Note that tracking errors of the
mount have dropped so far below the noise floor set by the seeing
conditions that they cannot be quantitatively distinguished from zero.
This combination will provide the best tracking accuracy, resulting in
sharp, round stars in your astro-images.