With a large aperture and a long effective focal length despite its short physical length, combined with a sturdy and precise mount, the Celestron CGX EQ 925 235mm f/10 Schmidt-Cassegrain GoTo Telescope is an ideal rig for both celestial observation and astrophotography. It comes with the Schmidt-Cassegrain telescope (SCT) optical tube assembly (OTA), a solid motorized equatorial mount, the venerable NexStar+ computer hand controller, an eyepiece, and a 90° star diagonal. Whether you're conducting planetary or deep-space viewing or imaging, the CGX EQ 925 provides near-research-quality performance while still being portable.
Celestron C9 1/4-A XLT 9.25" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGE Dovetail)
Outfitted with a large aperture, long effective focal length, and their proprietary StarBright XLT optical coatings, the Celestron C9 1/4-A XLT 9.25" f/10 Schmidt-Cassegrain Telescope provides power and portability. The coating system consists of anti-reflection coatings on the corrector plate, highly reflective index mirror coatings, and low-absorption/high-transmission glass components to ensure that the maximum amount of light is gathered and transmitted to your eye. This system ensures bright and clear high-contrast images with accurate color rendition across the entire visual spectrum without visible distortion at the edges. Celestron includes a standard 1.25" visual back to accept eyepieces and accessories such as the 25mm eyepiece and 90° diagonal supplied with the optical tube assembly (OTA). This OTA is offered here without a mount or tripod for users who already have a support system. Just ensure the mount's payload capacity exceeds 20 pounds to safely carry the weight and that the mount has a Losmandy-style saddle to match the OTA's CGE mounting plate.
Optical Tube
- 9.25" (235mm) aperture
- f/10 focal ratio
- 2350mm effective focal length
- Schmidt-Cassegrain design optical path
- StarBright XLT optical coatings
- Resolution: 0.59 arcsec (Rayleigh); 0.49 arcsec (Dawes)
- Secondary mirror obstruction: 3.35" (85 mm); 36% by diameter; 13% by area
StarBright XLT System
- Maximizes light transmission through optical path
- Improves color rendition, contrast, sharpness, resolution, and brightness
- Broadband system provides flat wavelength transmission across the entire visual spectrum
- Multi-layer mirror coatings with layers of aluminum, SiO2 (quartz), and TiO2 (titanium dioxide)
- Multi-layer anti-reflective corrector plate coatings with layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide); hafnium has a wider band-pass than the commonly used titanium
- High-transmission water white glass corrector plate limits light loss due to internal absorption
Mounting
- Optical tube only—mount and tripod required for proper use
- Supplied with CGE dovetail plate, which is compatible with Losmandy-style saddles
- Mount must have a payload capacity of over 20 pounds to safely support the OTA
Included Accessories
- Visual back:
- Standard threads for Schmidt-Cassegrain telescope optical tubes
- 1.25" eyepiece holder accepts 1.25" eyepieces and accessories
- Eyepiece:
- 1.25"-diameter barrel
- Accepts most 1.25" astronomical filters
- 25mm focal length produces 94x magnification
- Diagonal:
- 1.25"-diameter barrel
- 90° angle places head in comfortable viewing position when scope is aimed at or near the zenith
- Star diagonal corrects view horizontally, but not vertically
- Finderscope:
- 6x magnification
- 30mm aperture
- Mounting bracket included
Celestron 17 lb Counterweight for the CGEM EQ Mount
Use the Celestron 17 lb Counterweight by itself or with other weights to balance your OTA and accessories on Celestron CG-5, CGEM, CG-4 mounts; or any similar mount with a 0.75" (19mm) center bore hole. A large thumbscrew allows you to lock the weight anywhere along the counterweight shaft to allow for precise balance.
