Engineered to deliver sharp and clear distortion-free views, the Celestron EdgeHD 9.25" f/10 Aplanatic Schmidt-Cassegrain Telescope is an ideal choice for observation, astrophotography, and imaging objects within or beyond our solar system. It features an aplanatic Schmidt-Cassegrain optical system consisting of a corrector plate, a spherical primary mirror, and a secondary mirror along with a set of field-flattening lenses integrated into the baffle tube. Complementing the EdgeHD system is the proprietary StarBright XLT optical coating system, which improves light transmission and reflectivity across the entire visual spectrum. The combination of EdgeHD and StarBright XLT produces bright and clear high-resolution images with true color rendition across the entire field of view without distortion, aberrations, or off-axis comas.

Optimized for imaging, the internal focusing system features mirror support clutches to ensure proper alignment and mirror locks to avoid accidental defocusing during long-exposure astrophotography. The optical tube is outfitted with an oversized 2" visual back to ensure large imaging sensors are completely covered to avoid vignetting. For visual observations, a 2" star diagonal is included along with a 23mm wide-angle eyepiece that yields a 102x magnification. A reducer adapter is provided to allow the use of smaller and more common 1.25" eyepieces and accessories. The EdgeHD 9.25 is offered here without a mount or tripod for users who already have a reliable support system and are looking to upgrade or add to their existing gear, but it comes with a large CGE dovetail plate that is compatible with Losmandy saddles.

9.25" (235mm) Schmidt-Cassegrain OTA    2350mm Focal Length, f/10 Focal Ratio    StarBright XLT Optical Coating System    EdgeHD Aplanatic Field-Flattener Design    23mm Luminos Wide-Angle Eyepiece    2" Visual Back and 90° Diagonal    9x50 Finderscope with Mounting Bracket    CGEM II GoTo EQ Mount with Tripod    NexStar+ Computer Hand Controller    40,000 Object Database with Sky Tours

• 9.25" (235mm) aperture
• f/10 focal ratio
• 2350mm effective focal length
• Aplanatic Schmidt-Cassegrain optical design
• EdgeHD field-flattener aplanatic design eliminates spherical aberration, field curvature, and off-axis star coma to improve resolution, sharpness, and clarity across the entire field of view, especially at the edges
• Diffraction-limited SCHOTT glass reduces internal light loss to improve color, clarity, and sharpness
• StarBright XLT optical coatings
• Flexible tension clutches hold the primary mirror in place to reduce image shift without putting any force or pressure on the mirror assembly, keeping subjects centered
• Internal mirror locks prevent accidental adjustment to focus—important during long-exposure astrophotography
• Integrated 95-micron mesh filter allows hot air to be released from behind the primary mirror without dust getting in, to prevent mirror distortion due to uneven surface temperatures
• Resolution: 0.59 arcsec (Rayleigh); 0.49 arcsec (Dawes)
• Secondary mirror obstruction: 3.35" (85mm); 36% by diameter; 13% by area

• 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

• OTA only; mount and tripod required for proper use
• Large CGE (Losmandy-style) dovetail plate

Visual Back:

• Standard Schmidt-Cassegrain telescope (SCT) threads
• 2" eyepiece/accessory holder
• Use for prime focus or projection astrophotography with optional adapters

Eyepiece:

• Luminos-series wide-angle
• 82° field of view
• 2"-diameter barrel
• Accepts most 2" eyepiece filters
• 23mm focal length yields 102x power
• Parfocal with all Luminos eyepieces, allowing it to be changed out with other Luminos eyepieces without having to adjust the focus
• Retractable eyecup for use with or without eyewear

Reducer adapter:

• 2"-to-1.25" reducer adapter allows the use of smaller eyepieces and accessories in visual back or diagonal

Diagonal:

• 90° angle puts head in comfortable viewing position
• Threaded for direct connection to OTA without the need for the visual back
• 2" eyepiece/accessory holder
• Star diagonal corrects image horizontally, but not vertically

Finderscope:

• Low 9x magnification preserves wide field of view to more easily find alignment or guide stars
• Large 50mm aperture helps to see dimmer objects and stars for easier star-hopping navigation

Related Questions and Answers

Q: 1. Would this set up be capable of nebulas/galaxies as well as some planets for astrophotograhpy?

A: Yes the Celestron EdgeHD CGE 8" f/10 Aplanatic Schmidt-Cassegrain GoTo EQ Telescope is capable of viewing planets, nebulae and galaxies. It is also suitable for use in astrophotography when used with a camera.

Q: 2. what is the closest you can view an object in daytime with the deluxe 925 edge HD?

A: It is relative to the eyepiece you are using. I would recommend the wide angle eyepiece. ( the higher millimeter eyepiece )

Q: 3. 1. Can you attach a phone to take pictures? 2. What is an economic mount we can get for this?

A: To attach a smartphone to the Celestron EdgeHD CGE 8" f/10 Aplanatic Schmidt-Cassegrain Telescope (OTA Only) you can use this adapter: https://bhpho.to/3bqiPIf. The Celestron advanced VX Mount would be recommended for the Celestron EdgeHD CGE 8" f/10 Aplanatic Schmidt-Cassegrain Telescope (OTA Only): https://bhpho.to/3FW892P

Q: 4. What is the difference between Celestron C11-A and Celestron C11. Does Celestron C11-A have any improvements?

A: Sorry but B&H no longer has a listing for the Celestron C11. only the Celestron C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGE Dovetail) BH #CEC11AXLT • MFR #91036-XLT

Q: 5. Can you see planets close up with this telescope or are they far away?

A: It would be very possible to see the planets Please understand that a lot will depend on the magnification of the eyepiece and the planets orbital position to the earth

Q: 6. Will a Nexstar 6 Evolution fit in this bag while still attached to its mount?

A: The Celestron Padded Soft Telescope Bag for 9.25" SCT/EdgeHD OTA is too small to fit the Celestron Nexstar Evolution 6 attached to the mount. You can use this case instead: https://bhpho.to/3WMjWdP

Q: 7. I see the mount handle obstructing the polar bore scope ? how do you polar align this with handle obstructing ?

A: The CGX and CGX-L mounts utilize the All Star Polar Alignment routine. It is substantially more accurate than a polar finder scope. However, if a customer insists on using a Polar Scope, we do offer one that is used off axis. But trust me, once you use All Star Polar Alignment - you will never want to use a polar scope again.

Q: 8. What adapters are needed to install **Astromania 2" Multiple 5-Position Filter Wheel** on the telescope?

A: The Starlight Xpress USB Filter Wheel with 5-Position 2" Eyepiece Filter Carousel (Female/Male T-Mounts) BH #STSXUFW2T • MFR #SXUFW-2T comes with the necessary adapters to mount it to the scope.

Q: 9. Can the Skywatcher AZ-EQ5 carry this OTA?

A: Yes this OTA will work on the Sky-Watcher AZ-EQ5 MULTI-PURPOSE GOTO MOUNT. The Load Capacity on the Mount is 30 lbs, and the OTA weigh's 27.5 lbs.

Q: 10. Does this include the mount and computer? That is, does it include everything listed in the description? It says that it's OTA.

A: The Celestron Advanced VX 9.25" EdgeHD Telescope BH #CEAVX925EHDK • MFR #12033 comes with: Celestron EdgeHD 9.25" f/10 Aplanatic Schmidt-Cassegrain Telescope (OTA Only) Celestron Luminos 23mm Eyepiece (2") 9x50 Finderscope 2" 90° Star Diagonal 1.25" Eyepiece Reducer Adapter Limited 2-Year Warranty Celestron Advanced VX GoTo German Equatorial Mount Stainless Steel Tripod with Tray Counterweight Bar 12 lb Counterweight Hand Controller Holder NexStar+ Hand Controller 12 VDC Car/Vehicle Power Cord Declination Motor Cable Limited 2-Year Warranty Celestron 12-Pound Counterweight for Advanced VX Two-Year Limited Warranty Yes it comes with the mount and tripod.