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Celestron CGE Pro 925 HD Goto Telescope C925 HD SC on a very stable CGE Pro mount

The CGE Pro 925 HD combines the modern, computer-controlled equatorial CGE Pro mount with the new Edge HD optics. With an opening of over 9 inches and our StarBright XLT coating, the CGE Pro 925 HD collects over a thousand times more light than the naked eye.

New optical design

EdgeHD stands for a new optical concept from Celestron, the "aplanatic Schmidt-Cassegrain telescope!

visibly sharper images
superior performance
improved mechanics
Fastar® compatible
EdgeHD (English: Edge High Definition) are aplanatic Schmidt telescopes that produce undistorted, sharp images up to the edge of a huge visual and photographic field of view. Not only is the coma corrected outside the optical axis, but also the field curvature!

Not only do you see hundreds of deep sky objects with remarkable sharpness, you can also take pictures without the blurred stars at the edge of the image due to the field curvature.

The difference

Many optical systems are propagated as "astrographs", but produce the coveted needle-sharp "pinpoint" star image along a curved line. On recordings with modern CCD cameras, the result is an image field curvature that increases towards the edge of the image field and becomes stronger the larger the chip is; i.e. the stars remain round, but they are inflated to small rings ("donuts").

In EdgeHD telescopes, in addition to the coma, this field curvature is corrected right up to the edge, so that even recordings with large CCD chips are completely sharp, with a uniformly large star image over the entire chip. Even at the edge of a full-frame sensor, the EdgeHD delivers 925 stars that are less than 1 arc second.

The EdgeHD 11 "optics has a nine times flatter image plane than a correspondingly large Schmidt-Cassegrain standard shows diffraction-limited stars on the entire image field of an SBIG STL11000!

EdgeHD Comparison

In EdgeHD telescopes, in addition to the coma, this field curvature is corrected right up to the edge, so that even recordings with large CCD chips are completely sharp, with a uniformly large star image over the entire chip.

EdgeHD Optics

Improved performance
The superior edge image not only provides rounder, prettier stars, but actually increases the resolution and limit size compared to telescopes with the same aperture. All optical surfaces are Starbright-XLT®-coated for maximum image brightness in the visual and photographic spectrum.
In addition to the new look, the mechanics and tube have also been completely redesigned. Innovations include:
Mirror locks hold the main mirror in any focus position without exerting pressure on the optical elements. The image always remains stable on the chip, even with long exposure times.
Ventilation openings behind the main mirror ensure rapid air exchange, so that the optics cool down quickly without competition. Thanks to an air filter system, no dust gets into the tube.
Adapted telecompressors (f / 7.5) and Barlow lenses (f / 20) are in development
Fastar-compatible - With Celestron's Fastar-compatible telescopes, a HyperStar lens system can be used in place of the secondary mirror in a few simple steps. This enables the installation of a camera (also DSLR) in the primary focus. The result: Your standard Celestron EdgeHD telescope with the optional HyperStar optics becomes a digital Schmidt design for your CCD or DSLR camera for photography in primary focus at f / 2 (C8, C11) and f / 1.9 (C14). The field size grows enormously, and exposure times of one to two minutes bring very good results.
Axiom eyepiece - EdgeHD 9.25 "telescopes are supplied with the high-end Axiom eyepieces. With a 23 mm focal length and 82 ° field of view, they offer an excellent combination of magnification and field of view. In addition, each Axiom eyepiece is for telescopes with a flat field of view optimized.
You can find out more about this system on the special EdgeHD website.

CGE PRO mount

The CGE Pro not only offers complete computer control with a database of over 40,000 objects, but is also a mechanical development of the successful CGE concept. It offers the following improvements:

Increased payload - A 14 "Schmidt-Cassegrain is stably and precisely carried for astrophotographic requirements - just like any other telescope with a tube weight of up to approx. 40kg (depending on the length).
All-Star Technology - The mount can be ordered with any bright reference star, even if you cannot see the polar star.
Northing without tools - Large, non-slip clamping screws for pole height and azimuth - this means that you can set the mounting axes quickly, easily and precisely even with deep minus degrees with gloves.
Pan across the Meridian possible - Unlike the CGE mount, it is no problem with the CGE Pro mount to track 20 degrees over the meridian without the telescope striking the mount or tripod or having to turn the device from east to west.
Faster positioning speed - Improved gears and motors allow higher speeds than ever before - up to five degrees per second. At the same time, the improved gears are a guarantee for more precise tracking. The motors and gear mechanism are strong enough to ensure normal operation even if the payload is poorly balanced.
Permanent PEC - The accuracy of the tracking without software corrections is +/- 9 arcseconds. The activation of "Permanent PEC" significantly improves this value.
Reduced gear backlash - pre-tensioned springs also press the worm against the worm wheel in the declination axis, which minimizes backlash.
Goto Accuracy - Following a simple alignment procedure, the CGE Pro approaches targets with up to five minutes of arc. With the advanced NexStar methods such as calibration stars, sync and precise Goto, accuracy can be improved down to an arc minute.
In addition to these improvements, the equatorial Celestron mounts have long offered features that both visual observers and photographers will appreciate. This includes:

Transportability - You can disassemble the CGE Pro into parts that are easy to transport. Unlike with fork mounts, you can easily separate the telescope from the mount. Even the CGE Pro 1400 can be set up in a few minutes.
Stability - For parallactic mounts, the center of gravity is directly above the tripod and you can align them on the Polarstern without additional pole height cradle. This prevents the "tuning fork effect" of undersized fork mounts. The CGE Pro has an improved, solid tripod with 2.75 "thick legs made of stainless steel, which can be extended to 1.40 meters. Two spiders additionally tension the legs and ensure even more stability.
Balance - CGE-Pro mounts can be easily balanced in both axes. To do this, simply move the telescope or the counterweights - you do not need any additional counterweights if you attach heavy accessories.
Free space - The telescope can rotate freely around the polar axis without hitting the mount. You can limit the swivel range using the software. This will prevent voluminous accessories from hitting the mount or tripod.
All telescopes with a CGE mount are compatible with the Celestron CN16 GPS receiver. When you connect the GPS to the built-in clock, you never have to enter the time and place again in the hand control box.

More information about the mount can be found on the CGE Pro website.

DETAILED INFORMATION

- 9.25 "EdgeHD optics
- StarBright XLT compensation
- equatorial, computer controlled CGE PRO mount
- Solid tripod with tubes made of NIROSta steel, height 96 to 144 centimeters
- 9x50 viewfinder with quick-release bracket
- 2 "zenith prism / mirror enables comfortable observation of objects close to zenith
- New optics design for point-like star imaging over a large image field
- Mirror locks hold the primary mirror in place to protect against mirror shifting
- Ventilation openings enable rapid temperature adjustment of the main mirror
- Fastar compatible for photography with f / 2
- Proven NexStar computer control
- Object database with 40,000 entries, over 100 user-definable objects and in-depth information on over 200 objects
- New "All-Star Polar Alignment" for precise northing without Polarstern and polar finder
- Flash upgradeable control software and motor control for downloading product updates from the Internet
- Software functions include: filtering of the database, last alignment (hibernate), five alignment routines, user-defined swivel limits
- Special database with the most popular deep sky objects by name and catalog number: the most beautiful double and multiple stars; Variable; Solar System; star pattern
- Double-line, 16-character LCD hand control with backlit LED buttons
- Tracking motors - 12VDC servo motor with integrated optical encoders offer a smooth and quiet use, as well as a long durability
- Permanently programmable Periodic Error Correction (PEC) - Correction of the periodic screw error
- Precisely manufactured polar axis with 40mm diameter supported by tapered roller bearings and ball bearings
- Autoguider, PC and aux port on the electronics cover of the mount for long-term astrophotography
- Latitude range: 10 ° to 65 ° north and south latitude
- RS-232 port on the hand control for controlling the device with a PC
- Includes NexRemote telescope control software e, for more advanced control of the mount by PC
- Optional GPS receiver can be retrofitted

TECHNICAL SPECIFICATIONS

OPTICAL DESIGN: EdgeHD
OPENING: 24 cm (9.25 ")
Focal length: 2350 mm
OPENING RATIO: 10
VIEWFINDER: 9x50
MOUNTING: equatorial, computer controlled CGE Pro
TUBE: aluminum
Ocular 1: 23 mm
MAGNIFICATION 1: 102 x
FACE FIELD: 0.8 °
CENTRAL PRISM / MIRROR: 2 "
TRIPOD: height-adjustable stainless steel tripod
CD ROM: NexRemote control software with RS232 cable
POWER SUPPLY: 12V car charger
HIGHEST SENSIBLE MAGNIFICATION: 555 x
LOWEST SENSIBLE MAGNIFICATION: 34 x
LIMIT SIZE: 14.4
RESOLUTION (RAYLEIGH): 0.59 arcseconds
RESOLUTION (DAWES): 0.49 arcseconds
LIGHT COLLECTION: 1127 x
FACE FIELD AT 1000m: 14 m
COMPENSATION: Starbright XLT Coating
LEAF MIRROR OBSTRUCTION: 85 mm
LEAF MIRROR OBSTRUCTION RELATIVE TO AREA: 13.1%
COLLAR MIRROR OBSTRUCTION RELATIVE TO DIAMETER: 36.2%
TUBE LENGTH: 56 cm
TUBE WEIGHT: 9.5 kg
TRIPOD AND COLUMN WEIGHT: 24 kg
MOUNTING WEIGHT: 34 kg
COUNTERWEIGHT ROD WEIGHT: 2.3 kg
COUNTERWEIGHT: 2 x 10 kg
SWING SPEED: Nine speeds: 5.5 ° / s, 2 ° / s, 0.5 deg / s, 64x, 16x, 8x, 4x, 1x, 0.5x
TRACKING SPEED: Sidereal, Solar and Lunar
TRACKING MODES: EQ North and EQ South
ALIGNMENT PROCEDURE: 2-Star Align, Solar System Align, Last Alignment, Quick Align, 1-Star Align
DATABASE: over 40,000 objects, 100 user-definable objects, in-depth information on over 200 objects
POWER SUPPLY: 12 V DC 3.5A
INTERNAL CLOCK: Yes
GPS: with optional CN-16 GPS module