Celestron CGX Equatorial 925 HD Telescope

EdgeHD Optics: A 235mm Aplanatic Astrograph with a 42mm Image Circle

The 9.25" EdgeHD optical system is engineered as an aplanatic, flat-field astrograph. It reduces more than off-axis star coma, giving an astrograph-quality flat focal plane more than three times flatter than a standard Schmidt-Cassegrain, so stars stay sharp to the edge of a flat camera sensor.

This superior edge performance not only produces aesthetically pleasing images but also improves resolution and limiting magnitude compared to other telescopes of the same 235mm aperture. Combined with Celestron's StarBright XLT optical coatings on every surface, the EdgeHD optics give maximum light throughput.

Imaging Versatility: Native f/10, Barlow, and Fastar f/2

At its native f/10, you get the image scale to capture the smallest deep-sky objects, and a Barlow adds power for high-resolution planetary, lunar and solar imaging.

All EdgeHD optical tubes are also Fastar-compatible. By replacing the secondary mirror with an optional third-party lens assembly, you can convert the telescope into an ultra-fast f/2 wide-field imaging system.

Optical Tube Design: Mirror Clutches for 9.25" Imaging Stability

The 21 lb aluminum tube was redesigned for imaging. Flexible tension clutches hold the primary mirror in place after focusing and reduce image shift during long exposures, without putting force on the mirror assembly.

Cooling vents on the rear cell, each with an integrated 50-mesh filter, let hot air out from behind the primary mirror without letting dust in.

CGX Mount Mechanics: A 55 lb Capacity, Belt-Driven Platform

The CGX mount is the foundation of this imaging system, providing a stable platform with a 55 lb instrument load capacity. Its lower profile head gives a more compact, more stable setup. The DC servo motors drive the worm gears through belts, which reduces backlash when the motor changes direction, and slew at up to 4° per second.

Home and limit optical sensors make it remote-operation friendly, cable management is improved, and the latitude range is 3° to 65°.

Tripod and Saddle: 2" Steel Legs and Dual Dovetail Compatibility

The mount is supported by a heavy-duty tripod with 2" diameter steel legs. The legs feature graduated markings, making it easy to set the tripod to the same height every time. An accessory tray is included.

The CGX mount head features a dual dovetail saddle plate. This versatile design accommodates both the narrow CG-5 (Vixen-style) and the wider CGE (Losmandy D-style) dovetail bars.

NexStar+ and CPWI: A 40,000+ Object Database with Full PC Control

The CGX 925 HD includes a comprehensive suite of control options. For quick setup and visual observing, the NexStar+ hand control offers a database of over 40,000 celestial objects and multiple alignment procedures. The mount features two auxiliary ports for accessories, a dedicated autoguide port, and a USB 2.0 port for direct connection to a PC.

For advanced users, Celestron's CPWI Telescope Control Software (included) runs on a PC connected to the mount's USB port, with a graphical interface and multi-point mount modeling. Starry Night Special Edition and the SkyPortal app are also included.

Setup and Polar Alignment: Celestron's All-Star Alignment Process

Achieving a precise polar alignment is critical for long-exposure astrophotography, and the CGX mount makes it simple with Celestron's All-Star Polar Alignment routine. It needs no polar finder scope, and can usually be completed in about 15 minutes even without a view of Polaris.

After aligning on stars, the mount slews to where a bright star would be if accurately polar aligned, and you center it with the mount's altitude and azimuth knobs, not the hand control.

Visual Observing: 102x Magnification with the Included 23mm Eyepiece

EdgeHD gives aberration-free images across a wide visual field too. The package includes a 9x50 finderscope for locating objects and a 2" star diagonal with a 1.25" adapter for comfortable viewing.

The included 23mm eyepiece gives 102x, and the limiting stellar magnitude is 14.4.

Astrophotography Integration: 146.05mm Back Focus and Autoguide Port

The EdgeHD 9.25" is designed for seamless integration into an imaging setup. The rear of the optical tube features a large 3.29"-16 tpi male thread and forms its best images 146.05mm (5.75") behind it, a generous back focus.

The CGX mount provides an autoguide port for connecting a guide camera for precise, long-exposure tracking. The mount also has periodic error correction.

System Weights and Transport: A 4-Part System with a 44 lb Head

The system comes apart into these pieces:

• Mount Head: 44 lbs (20 kg)
• Optical Tube: 21 lbs (9.53 kg)
• Tripod: 19.2 lbs (8.7 kg)
• Counterweights: 2 x 11 lbs each