ABOUT Celestron EDGEHD 9.25 Optical Tube Assembly
Experience our best optical performance with EdgeHD’s aplanatic, flat field Schmidt-Cassegrain optics for pinpoint stars all the way to the edge of today’s largest imaging sensors and widest eyepieces.
Aluminum optical tube with tube vents featuring an integrated 95-micron mesh filter allows hot air to be released from behind the primary mirror. Mirror support knobs hold the mirror in place and reduce image shift during imaging.
Versatile design accommodates 2 focal ratios: native f/10 or ultra-fast f/2 imaging with a removable secondary mirror and third-party accessories.
Celestron’s premium StarBright XLT coatings provide maximum light transmission.
A 9x50 finderscope, 2” mirror diagonal for more comfortable viewing, and wide-angle 23 mm Luminos 2" eyepiece are all included.
ABOUT HyperStar 3 Lens
Now 9.25" SCT owners can join the HyperStar revolution. Ultra-fast, wide-field CCD imaging has never been easier. HyperStar quickly converts your SCT into a fast imaging system. The HyperStar lens easily replaces the secondary mirror in the telescope, allowing a camera to be placed in front of the telescope. Switching between HyperStar and standard configurations is quick and simple--no tools required. See this video for a demonstration.
The HyperStar C9.25 lens converts a Celestron Edge HD 9.25" SCT from f/10 to f/2.3, making the system 18 times faster. That means 18-times shorter exposures! Now you can capture deep-sky images without guiding and without an equatorial wedge (in alt-az configuration). The HyperStar lens shortens the focal length of the telescope, giving a much wider field of view, and giving a greater tolerance of tracking errors, allowing for unguided, alt-az imaging.
The HyperStar C9.25 is compatible with a variety of cameras, including both CCDs and DSLRs. Like the other 8" and larger HyperStar models, the HyperStar C9.25 covers up to a 27mm (APS-size) sensor. Separate adapters are required for different cameras. One adapter is included with the HyperStar lens.
Optical performance is excellent, with a coma-free, flat field of view almost 3 degrees wide.
Why are the other HyperStar lenses faster?
The 9.25" SCT uses a slightly different optical configuration, in order to produce a flatter field of view and have a smaller central obstruction. This means it uses a slower primary mirror (f/2.3 versus the f/2 mirror in other SCTs). This means the HyperStar has to be slightly slower to retain its excellent optical performance. The difference between f/2.3 and f/2 is negligible.
Focal Ratio: f/2.3
Focal Length: 540mm
Maximum Usable Sensor Size: 27mm Diagonal (APS Format)
Field of View (with 27mm sensor): 2.8 degrees
CANON DSLR Compatible
Camera Adapter Threaded for 2" (48mm) Filters
Backfocus (from mounting thread to focal plane): 59.7mm (2.35")
Length (without camera adapter): 4.2"
Weight: 1.8 lbs.
Remarks: Items are not sold separately.
1x C9.25 HD f/10 SCT OTA with CGE wide dovetail plate
1x Celestron 9x50 Optical Finderscope
1x Celestron 2" Mirror Diagonal with 1.25" Adapter
1x Starizona HyperStar 3 Lens for C9.25HD
1x Safety Case for HyperStar 3 Lens