Celestron Edgehd 11" F/10 Aplanatic Schmidt-cassegrain Telescope (ota Only)
- Product Code: ga214122
-
Engineered to deliver sharp and clear distortion-free views, the Celestron EdgeHD 11" 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 respectable 122x power. A reducer adapter is provided to allow the use of smaller and more common 1.25" eyepieces and accessories. The EdgeHD 11 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.
11" (280mm) Schmidt-Cassegrain OTA 2800mm 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 Internal Focusing with Mirror Locks 9x50 Finderscope with Mounting Bracket Large CGE (Losmandy) Dovetail Plate OTA Only; Mount and Tripod Required
Parameters | |
---|---|
Optical Design | Aplanatic Schmidt-Cassegrain |
Aperture | 11.0" / 279.4mm |
Focal Length | 2800mm |
Focal Ratio | f/10 |
Eyepiece Barrel Diameter | 2.0" 1.25" with included reducer |
Diagonal | 90° star 2" snout and eyepiece holder |
Finderscope | 9x50 |
Tripod | None |
Mount Type | CGE dovetail plate Compatible with Losmandy-style saddles |
Power Source | None |
Optical Tube Length | 24.0" / 61.0 cm |
Weight | 28.0 lb / 12.7 kg |
Packaging Info | |
Package Weight | 45 lb |
Box Dimensions (LxWxH) | 30 x 19 x 18" |
- 11" (280mm) aperture
- f/10 focal ratio
- 2800mm 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: 0.5 arcsec (Rayleigh); 0.42 arcsec (Dawes)
- Secondary mirror obstruction: 3.75" (95 mm); 34% by diameter; 12% 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 122x 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. Can this scope with EdgeHD optics and Evolution mount be purchased without StarSense?
A: Yes it can. Here is a direct link: https://bhpho.to/2iAedkk
Q: 2. Can the magnification be changed? Like if I want to see it at a 100x? And then change it to 480x?
A: The only way to change magnification is with a more powerful eyepiece ( lower mm) or by a 2X Barlow lens which will increase the magnification of your existing eyepiece by 2X
Q: 3. What is the Celestron nexstar evolution 9.25 WiFi band? (2.4G? 5G? other?). Thanks.
A: The Celestron NexStar Evolution 8 203mm f/10 Schmidt-Cassegrain GoTo Telescope uses 2.4Ghz wifi.
Q: 4. Does this still have the RS232 port or has it been upgraded to USB?
A: The Celestron NexStar Evolution 8 203mm f/10 EdgeHD Aplanatic Cassegrain GoTo Telescope with StarSense AutoAlign has been upgraded to a USB port.
Q: 5. What is the Celestron nexstar evolution WiFi band? (2.4G? 5G? other?). Thanks.
A: It is 2.4ghz.
Q: 6. Can only the telescope be purchased without the kit?
A: The Celestron NexStar Evolution 8 203mm f/10 Schmidt-Cassegrain GoTo Telescope BH #CENSE8 • MFR #12091 https://www.bhphotovideo.com/c/product/1046796-REG/celestron_12091_nexstar_evolution_8_telescope.html Is only sold as a complete set; Optical Tube Assembly (OTA) Mount Goto handheld computer Tripod
Q: 7. When will this product be available for shipping? 8 EvolutionHD With Star Sense
A: Please email us at optics@a href= http://bhphoto.com target= _blank bhphoto.com/a for assistance with your inquiry.
Q: 8. What do I need to use 2 inch EPs?
A: You need a 2 diagonal (I use a Televue) and a 2 Visual Back to mate it to the optical tube. You can use a 2 to 1.25 adaptor to mount 1.25 eyepieces into the 2 diagonal so you can switch to a high power eyepiece without having to remove the 2 diagonal and visual back.
Q: 9. Is the 9.6v 4.5aHr LiFePO rechargeable battery user replaceable?
A: Yes, the internal LIfePO rechargeable battery is user replaceable. For warranty service, the NexStar Evolution mount will need to be sent to Celestron for battery replacement. Please contact Celestron Technical Support for additional details. You can email them at: mail@celestronsupport.com
Q: 10. Is hard box included ?
A: This kit does have the JMI Telescopes Hard Carrying Case for 8" Celestron NexStar Evolution.
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