Description
The HyperStar 11 replaces the secondary mirror of any Fastar-compatible C8 SCT and transforms it from a f/10 planetary scope into a f/1.9 imaging powerhouse — 25× faster, with a coma-free field over 3.7° wide. No guiding, no equatorial wedge required.
Camera Compatibility
The Standard Camera Adapter included with every HyperStar 11 has an M42 threaded top and is pre-set for cameras with 17.5 mm of backfocus and accepts 2" mounted M48 Filters.
| Model | HyperStar 11 (C11 v4) |
| Focal ratio | f/1.9 |
| Focal length | 540 mm |
| Speed increase | 25× faster than stock f/10 |
| Field of view | Up to 3.7° — coma-free, flat field |
| Max sensor size | 35 mm |
| Compatible Optical Tubes | Celestron C8 (standard SCT) and EdgeHD 8 — via included EdgeHD Adapter Ring |
| HyperStar backfocus with included camera adapter and Filter Slider Upgrade | 17.5 mm |
| Included adapter threads | M42 male top (M54 top sold separately) |
| Optional Filter Slider Threads | Both M42 male and M54 male |
| Origin | 🇺🇸 Designed and built in Tucson, Arizona. |
HyperStar Version Comparison
FAQ
Do I need the Filter Slider to use filters with the HyperStar?
No. The Standard Camera Adapter that ships with every HyperStar has an M42 threaded top that accepts one 2" mounted filter — ideal for a broadband, dual-band or IR-cut filter with a one-shot color camera. The Filter Slider is a helpful upgrade for monochrome shooters or anyone wanting to change filters throughout your imaging session.
What cameras does the included adapter work with?
The Standard Camera Adapter is M42-threaded and pre-set for 17.5 mm backfocus — which covers most popular cooled astrocameras. If your camera needs a different thread size or backfocus, check out our HyperStar Adapter page.
Are HyperStars hard to focus?
Not really. A Bahtinov mask, an autofocuser like the EAF, or any software showing FWHM all work well. The fast f/ratio does make backfocus more critical — which is why our adapters are machined with precise accuracy.
What telescopes are compatible?
Any factory Fastar-compatible C11 SCT. Older non-Fastar scopes can be upgraded with our C11 Conversion Kit. The HyperStar 11 works on both standard C11 and EdgeHD 11 OTAs thanks to the included EdgeHD Adapter Ring.
Will I need spacers for correct backfocus?
No. Every HyperStar ships with the correct adapter already set to the right backfocus. Install the HyperStar, attach your camera, and start imaging.
If I have a Non-EdgeHD HyperStar can I use the EdgeHD Adapter Ring?
Yes — non-HD v3 and v4 HyperStars can use the EdgeHD Adapter Ring to mount on the same-size EdgeHD OTA. The HyperStar 9.25 is unique and works on both standard and EdgeHD 9.25 tubes without any additional adapter.
Additional Resources