The HyperStar C9.25 lens converts a standard Celestron 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.
What telescopes are compatible?
Only new, factory-equipped Fastar-compatible 9.25" SCT telescopes have a removable secondary mirror assembly, allowing the use of the HyperStar C9.25 lens. Older 9.25" SCTs are NOT compatible, nor can they be converted.
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
- 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.
Watch a HyperStar demo under light polluted skies using an Alt-Az mount.