I have a HyperStar C9.25 V3 Lens with Canon adapter for sale. I bought this second hand with a 9.25 Edge HD and it has been sitting in my Astronomy warm room unused for a few years. I know I will never use it so I want to it to go to someone who will. Please see the full description of the product I copied and pasted from
https://camera-concepts.shoplightspe...edge-hd-w.html.
Product code - HS3-C925HD-FS
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.
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.
FAQs
What telescopes are compatible?
The Edge HD 9.25" SCT telescope has a removable secondary mirror assembly, allowing the use of the HyperStar C9.25 lens.
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.
Specifications
* 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
* 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"
* Diameter: 4.1"
* Weight: 1.8 lbs.
I am asking $750 delivered.
