Celestron 9.25" EdgeHD 925 Schmidt-Cassegrain Telescope OTA
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- EdgeHD Optics: Flat-field design delivers sharp, pinpoint stars across large sensors and wide eyepieces
- Imaging-Ready OTA: Cooling vents and mirror support knobs improve thermal performance and imaging stability
- Three Focal Ratios: Supports native f/10, optional f/7 reduction, and ultra-fast f/2 imaging
- StarBright XLT Coatings: Maximizes light transmission for brighter, higher-contrast views
- Included Accessories: 9x50 finderscope, 2" mirror diagonal, and 23mm Luminos 2" eyepiece
See the Universe in EdgeHD!
EdgeHD is an aplanatic, flat field Schmidt-Cassegrain telescope that produces aberration-free images across a wide visual and photographic field of view. The optical system was designed to reduce more than just off-axis star coma; it also provides an astrograph-quality flat focal plane all the way to the edge of the field of view.
Many optical designs that advertise themselves as "astrographs" actually only produce pinpoint stars across a curved focal plane. While this may be acceptable for some visual observing, stars will appear out of focus at the edge when used with the flat chip sensor of a digital camera. EdgeHD optics produce a focal plane more than three-times flatter than a standard Schmidt-Cassegrain telescope and dramatically flatter than competing coma-free designs. This guarantees you visibly sharp stars across some of the largest CCD chips available today.
Celestron Explores What Sets the EdgeHD Optics Above the Rest!
EdgeHD Imaging Advantages
9.25" EdgeHD Optics
The large 9.25" aperture gathers plenty of light for detailed planetary, lunar, and deep-sky observing. EdgeHD optics also maintain a flatter field with sharper stars toward the edges for imaging.
Flexible Imaging Speeds
Use the telescope at its native f/10, pair it with an optional reducer for f/7, or add a compatible HyperStar system for ultra-fast f/2 imaging. This gives you more flexibility for different targets and imaging styles.
Imaging-Focused Design
Mirror support locks help reduce movement during long exposures, while 50-micron micromesh filter cooling vents help the optical tube reach ambient temperature faster for more stable imaging sessions.
Images Captured with the 11" EdgeHD
M100 (NGC 4321)
The Dumbbell Nebula (M27)
Horsehead Nebula (IC 434)
EdgeHD Aplanatic, Flat-Field Optics
Unlike a traditional Schmidt-Cassegrain, the EdgeHD optical system incorporates corrective optics that reduce field curvature and off-axis coma. This produces tighter, more consistent stars across large imaging sensors and wide-field eyepieces, while Celestron’s StarBright XLT coatings improve overall light transmission.
Fastar-Compatible for Ultra-Fast f/2 Imaging
The removable secondary mirror allows it to accept a compatible third-party Fastar/HyperStar lens system for imaging at approximately f/2. This dramatically shortens exposure times and provides a much wider field of view for large nebulae and other extended deep-sky targets. The telescope can also operate at its native f/10 or at f/7 with Celestron’s optional EdgeHD reducer.
Reducers not included and sold separately*
Ready for Visual Observing
The EdgeHD 9.25 OTA includes a 23mm Luminos 2" eyepiece, 2" mirror diagonal, and 9x50 finderscope, giving you a capable visual setup right out of the box. The wide-angle Luminos eyepiece pairs especially well with the telescope’s 2350mm native focal length, while the finder makes locating and centering targets easier before moving to higher magnification.
Specifications
- Optical Design: EdgeHD (Flat-Field Schmidt-Cassegrain)
- Aperture: 234.95 mm (9.25")
- Focal Length: 2350 mm
- Focal Ratio: f/10
- Image Circle: 42 mm
- Optical Coatings: StarBright XLT
- Backfocus: 146 mm
- Secondary Mirror Obstruction: 85 mm (3.35")
- Secondary Obstruction (Diameter): 36%
- Secondary Obstruction (Area): 13%
- Highest Useful Magnification: 555x
- Lowest Useful Magnification: 34x
- Limiting Stellar Magnitude: 14.4
- Resolution (Rayleigh): 0.59 arcsec
- Resolution (Dawes): 0.49 arcsec
- Light Gathering Power: 1127x (vs. human eye)
- Optical Tube Material: Aluminum
- Optical Tube Length: 559 mm (22")
- Optical Tube Diameter: 271.78 mm (10.7")
- Optical Tube Weight: 21 lb (9.53 kg)
- Dovetail: CGE Dovetail Bar
- Included Eyepiece: 23 mm
- Eyepiece Magnification: 102x
- Finderscope: 9x50
- Star Diagonal: 2" with 1.25" adapter
Solar Warning:
- Never look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result.
- Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it.
- Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.
Individually Tested:
Every EdgeHD that ships has been tested not only for the surface quality of each optical component, but also with a camera and artificial star to ensure the imaging system meets our rigid quality assurance. This “final acceptance test” confirms the EdgeHD will perform in the field and deliver high-quality astroimages.
EdgeHD 9.25" Dimensional Drawing
Other Information
- Country of Manufacture: China
- Celestron Warranty: Two-year factory limited warranty (within US/Canada only).
See the Universe in EdgeHD!
EdgeHD is an aplanatic, flat field Schmidt-Cassegrain telescope that produces aberration-free images across a wide visual and photographic field of view. The optical system was designed to reduce more than just off-axis star coma; it also provides an astrograph-quality flat focal plane all the way to the edge of the field of view.
Many optical designs that advertise themselves as "astrographs" actually only produce pinpoint stars across a curved focal plane. While this may be acceptable for some visual observing, stars will appear out of focus at the edge when used with the flat chip sensor of a digital camera. EdgeHD optics produce a focal plane more than three-times flatter than a standard Schmidt-Cassegrain telescope and dramatically flatter than competing coma-free designs. This guarantees you visibly sharp stars across some of the largest CCD chips available today.
Celestron Explores What Sets the EdgeHD Optics Above the Rest!
EdgeHD Imaging Advantages
9.25" EdgeHD Optics
The large 9.25" aperture gathers plenty of light for detailed planetary, lunar, and deep-sky observing. EdgeHD optics also maintain a flatter field with sharper stars toward the edges for imaging.
Flexible Imaging Speeds
Use the telescope at its native f/10, pair it with an optional reducer for f/7, or add a compatible HyperStar system for ultra-fast f/2 imaging. This gives you more flexibility for different targets and imaging styles.
Imaging-Focused Design
Mirror support locks help reduce movement during long exposures, while 50-micron micromesh filter cooling vents help the optical tube reach ambient temperature faster for more stable imaging sessions.
Images Captured with the 11" EdgeHD
M100 (NGC 4321)
The Dumbbell Nebula (M27)
Horsehead Nebula (IC 434)
EdgeHD Aplanatic, Flat-Field Optics
Unlike a traditional Schmidt-Cassegrain, the EdgeHD optical system incorporates corrective optics that reduce field curvature and off-axis coma. This produces tighter, more consistent stars across large imaging sensors and wide-field eyepieces, while Celestron’s StarBright XLT coatings improve overall light transmission.
Fastar-Compatible for Ultra-Fast f/2 Imaging
The removable secondary mirror allows it to accept a compatible third-party Fastar/HyperStar lens system for imaging at approximately f/2. This dramatically shortens exposure times and provides a much wider field of view for large nebulae and other extended deep-sky targets. The telescope can also operate at its native f/10 or at f/7 with Celestron’s optional EdgeHD reducer.
Reducers not included and sold separately*
Ready for Visual Observing
The EdgeHD 9.25 OTA includes a 23mm Luminos 2" eyepiece, 2" mirror diagonal, and 9x50 finderscope, giving you a capable visual setup right out of the box. The wide-angle Luminos eyepiece pairs especially well with the telescope’s 2350mm native focal length, while the finder makes locating and centering targets easier before moving to higher magnification.
Specifications
- Optical Design: EdgeHD (Flat-Field Schmidt-Cassegrain)
- Aperture: 234.95 mm (9.25")
- Focal Length: 2350 mm
- Focal Ratio: f/10
- Image Circle: 42 mm
- Optical Coatings: StarBright XLT
- Backfocus: 146 mm
- Secondary Mirror Obstruction: 85 mm (3.35")
- Secondary Obstruction (Diameter): 36%
- Secondary Obstruction (Area): 13%
- Highest Useful Magnification: 555x
- Lowest Useful Magnification: 34x
- Limiting Stellar Magnitude: 14.4
- Resolution (Rayleigh): 0.59 arcsec
- Resolution (Dawes): 0.49 arcsec
- Light Gathering Power: 1127x (vs. human eye)
- Optical Tube Material: Aluminum
- Optical Tube Length: 559 mm (22")
- Optical Tube Diameter: 271.78 mm (10.7")
- Optical Tube Weight: 21 lb (9.53 kg)
- Dovetail: CGE Dovetail Bar
- Included Eyepiece: 23 mm
- Eyepiece Magnification: 102x
- Finderscope: 9x50
- Star Diagonal: 2" with 1.25" adapter
Solar Warning:
- Never look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result.
- Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it.
- Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.
Individually Tested:
Every EdgeHD that ships has been tested not only for the surface quality of each optical component, but also with a camera and artificial star to ensure the imaging system meets our rigid quality assurance. This “final acceptance test” confirms the EdgeHD will perform in the field and deliver high-quality astroimages.
EdgeHD 9.25" Dimensional Drawing
- 1x Celestron EdgeHD 9.25" Optical Tube Assembly
- 1x 23 mm Luminos 2" Eyepiece
- 1x 2" Mirror Star Diagonal
- 1x 1.25" Adapter
- 1x 9x50 Finderscope
- 1x CGE Dovetail Bar
- EdgeHD Optics: Flat-field design delivers sharp, pinpoint stars across large sensors and wide eyepieces
- Imaging-Ready OTA: Cooling vents and mirror support knobs improve thermal performance and imaging stability
- Three Focal Ratios: Supports native f/10, optional f/7 reduction, and ultra-fast f/2 imaging
- StarBright XLT Coatings: Maximizes light transmission for brighter, higher-contrast views
- Included Accessories: 9x50 finderscope, 2" mirror diagonal, and 23mm Luminos 2" eyepiece
See the Universe in EdgeHD!
EdgeHD is an aplanatic, flat field Schmidt-Cassegrain telescope that produces aberration-free images across a wide visual and photographic field of view. The optical system was designed to reduce more than just off-axis star coma; it also provides an astrograph-quality flat focal plane all the way to the edge of the field of view.
Many optical designs that advertise themselves as "astrographs" actually only produce pinpoint stars across a curved focal plane. While this may be acceptable for some visual observing, stars will appear out of focus at the edge when used with the flat chip sensor of a digital camera. EdgeHD optics produce a focal plane more than three-times flatter than a standard Schmidt-Cassegrain telescope and dramatically flatter than competing coma-free designs. This guarantees you visibly sharp stars across some of the largest CCD chips available today.
Celestron Explores What Sets the EdgeHD Optics Above the Rest!
EdgeHD Imaging Advantages
9.25" EdgeHD Optics
The large 9.25" aperture gathers plenty of light for detailed planetary, lunar, and deep-sky observing. EdgeHD optics also maintain a flatter field with sharper stars toward the edges for imaging.
Flexible Imaging Speeds
Use the telescope at its native f/10, pair it with an optional reducer for f/7, or add a compatible HyperStar system for ultra-fast f/2 imaging. This gives you more flexibility for different targets and imaging styles.
Imaging-Focused Design
Mirror support locks help reduce movement during long exposures, while 50-micron micromesh filter cooling vents help the optical tube reach ambient temperature faster for more stable imaging sessions.
Images Captured with the 11" EdgeHD
M100 (NGC 4321)
The Dumbbell Nebula (M27)
Horsehead Nebula (IC 434)
EdgeHD Aplanatic, Flat-Field Optics
Unlike a traditional Schmidt-Cassegrain, the EdgeHD optical system incorporates corrective optics that reduce field curvature and off-axis coma. This produces tighter, more consistent stars across large imaging sensors and wide-field eyepieces, while Celestron’s StarBright XLT coatings improve overall light transmission.
Fastar-Compatible for Ultra-Fast f/2 Imaging
The removable secondary mirror allows it to accept a compatible third-party Fastar/HyperStar lens system for imaging at approximately f/2. This dramatically shortens exposure times and provides a much wider field of view for large nebulae and other extended deep-sky targets. The telescope can also operate at its native f/10 or at f/7 with Celestron’s optional EdgeHD reducer.
Reducers not included and sold separately*
Ready for Visual Observing
The EdgeHD 9.25 OTA includes a 23mm Luminos 2" eyepiece, 2" mirror diagonal, and 9x50 finderscope, giving you a capable visual setup right out of the box. The wide-angle Luminos eyepiece pairs especially well with the telescope’s 2350mm native focal length, while the finder makes locating and centering targets easier before moving to higher magnification.
Specifications
- Optical Design: EdgeHD (Flat-Field Schmidt-Cassegrain)
- Aperture: 234.95 mm (9.25")
- Focal Length: 2350 mm
- Focal Ratio: f/10
- Image Circle: 42 mm
- Optical Coatings: StarBright XLT
- Backfocus: 146 mm
- Secondary Mirror Obstruction: 85 mm (3.35")
- Secondary Obstruction (Diameter): 36%
- Secondary Obstruction (Area): 13%
- Highest Useful Magnification: 555x
- Lowest Useful Magnification: 34x
- Limiting Stellar Magnitude: 14.4
- Resolution (Rayleigh): 0.59 arcsec
- Resolution (Dawes): 0.49 arcsec
- Light Gathering Power: 1127x (vs. human eye)
- Optical Tube Material: Aluminum
- Optical Tube Length: 559 mm (22")
- Optical Tube Diameter: 271.78 mm (10.7")
- Optical Tube Weight: 21 lb (9.53 kg)
- Dovetail: CGE Dovetail Bar
- Included Eyepiece: 23 mm
- Eyepiece Magnification: 102x
- Finderscope: 9x50
- Star Diagonal: 2" with 1.25" adapter
Solar Warning:
- Never look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result.
- Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it.
- Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.
Individually Tested:
Every EdgeHD that ships has been tested not only for the surface quality of each optical component, but also with a camera and artificial star to ensure the imaging system meets our rigid quality assurance. This “final acceptance test” confirms the EdgeHD will perform in the field and deliver high-quality astroimages.
EdgeHD 9.25" Dimensional Drawing
Other Information
- Country of Manufacture: China
- Celestron Warranty: Two-year factory limited warranty (within US/Canada only).
| Telescope Focal Length | 2001 - 2500mm |
|---|
- 1x Celestron EdgeHD 9.25" Optical Tube Assembly
- 1x 23 mm Luminos 2" Eyepiece
- 1x 2" Mirror Star Diagonal
- 1x 1.25" Adapter
- 1x 9x50 Finderscope
- 1x CGE Dovetail Bar
Celestron 9.25" EdgeHD 925 Schmidt-Cassegrain Telescope OTA