Celestron 9.25" Edge HD Optical Tube Assembly (CGE) (91040-XLT)
$3,099.00
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Celestron 9.25" Edge HD Optical Tube Assembly (CGE) (91040-XLT)
$3,099.00
Aperture Size
Large 9.25 Inch Light Capture
Flat Field
Aberration Free Edge To Edge
Focal Ratio
Native f10 Optical Precision
XLT Coatings
Maximum Light Throughput Transmission
Fastar System
Convert To Ultra Fast f2
Mirror Clutches
Reduce Image Shift During Exposures
Astrograph Precision UnlockedPinpoint Stars Across Wide Sensors
The Celestron 9.25 EdgeHD Optical Tube Assembly (OTA) is an aplanatic, flat-field Schmidt-Cassegrain telescope designed to deliver astrograph-quality images. Engineered to eliminate coma and field curvature, this premium optical tube ensures pinpoint star clarity across the entire focal plane of large modern camera sensors. Combined with StarBright XLT optical coatings, it offers exceptional contrast and light transmission for deep-sky imaging and high-magnification planetary observation.
Flat Field Optical PerformanceAdvanced Mechanical and Optical Engineering
Experience uncompromising astronomical clarity with the Celestron 9.25 EdgeHD Optical Tube Assembly. Featuring Celestron's award-winning EdgeHD optical design, this Schmidt-Cassegrain telescope produces a focal plane more than three times flatter than standard Schmidt-Cassegrain systems, ensuring sharp focus out to the furthest edges of full-frame CCD and CMOS sensors. Integrated flexible tension mirror clutches hold the primary mirror safely in place without putting undue stress on the optics, preventing annoying image shift during long-exposure astrophotography.
Thermal management is simplified thanks to rear cell cooling vents fitted with 50-mesh filters, allowing internal hot air to escape while keeping dust out. Designed for ultimate versatility, the Celestron 9.25 EdgeHD OTA features Fastar compatibility, allowing you to remove the secondary mirror and attach third-party lens assemblies for ultra-fast f/2 wide-field deep-sky photography. Every optical tube undergoes individual camera and artificial star testing to ensure optimal real-world performance night after night.
Technical SpecificationsCelestron 9.25 EdgeHD Data
Optical Design
EdgeHD Aplanatic Flat-Field Schmidt-Cassegrain
Aperture
234.95mm / 9.25 in
Focal Length
2350mm / 93 in
Focal Ratio
f/10
Optical Coatings
StarBright XLT
Optical Tube Material
Aluminum
Optical Tube Length
559mm / 22 in
Optical Tube Diameter
271.78mm / 10.7 in
Optical Tube Weight
21 lbs / 9.53 kg
Finderscope
9x50
Star Diagonal
2 in with 1.25 in Adapter
Included Eyepiece
23mm Luminos 2 in (102x magnification) (eye)
Highest Useful Magnification
555x
Lowest Useful Magnification
34x
Limiting Stellar Magnitude
14.4
Resolution (Rayleigh)
0.59 arc seconds
Resolution (Dawes)
0.49 arc seconds
Light Gathering Power
1127x compared to human eye
Secondary Mirror Obstruction
85mm / 3.35 in (36% by diameter, 13% by area) (circle)
Dovetail
CGE Dovetail Bar
Astrograph Feature SetBuilt for Deep Sky Imaging
Optical SystemAplanatic flat-field Schmidt-Cassegrain design
Mirror StabilityFlexible tension clutches keep images centered
Thermal ManagementRear tube vents with 50-mesh filter block dust
Fastar VersatilityRemovable secondary mirror for fast f/2 imaging
Optical CoatingsProprietary StarBright XLT max light transmission
Included Eyepiece23mm Luminos wide-angle 2 in eyepiece
Included Accessories9x50 finderscope and 2 in star diagonal
Quality AssuredIndividually tested with artificial star and camera
Frequently Asked QuestionsEverything you need to know
What makes the Celestron 9.25 EdgeHD Optical Tube Assembly different from standard Schmidt-Cassegrain telescopes?
The Celestron 9.25 EdgeHD Optical Tube Assembly features a custom flat-field optical design that eliminates off-axis star coma and produces a focal plane over three times flatter than standard Schmidt-Cassegrain telescopes, preventing out-of-focus stars at the edges of camera sensors.
Is the Celestron 9.25 EdgeHD Optical Tube Assembly compatible with Fastar f/2 imaging system accessories?
Yes, the Celestron 9.25 EdgeHD Optical Tube Assembly is Fastar-compatible, allowing you to remove the secondary mirror and attach third-party lens systems to convert the focal ratio to ultra-fast f/2 wide-field astrophotography.
What mount dovetail rail comes pre-installed on the Celestron 9.25 EdgeHD Optical Tube Assembly?
The Celestron 9.25 EdgeHD Optical Tube Assembly comes equipped with a wider CGE dovetail bar (Losmandy-style) for mounting to heavy-duty equatorial tracking mounts.
How do the mirror clutches on the Celestron 9.25 EdgeHD Optical Tube Assembly work?
The flexible tension mirror clutches hold the primary mirror securely in position without exerting stress on the glass, which minimizes mirror flop and unwanted image shift during long-exposure astrophotography.