Description

The Starizona HyperStar 11 v4 converts your Celestron 11″ Schmidt-Cassegrain into an f/1.9 wide-field astrograph — 25 times faster than the native f/10 system. With 11 inches of aperture operating at f/1.9, this is one of the most powerful fast-imaging platforms available to amateur astronomers.

The v4 optics deliver a coma-free, flat field of view 3.7 degrees wide, and the system supports sensors up to 35mm diagonal — making it fully compatible with full-frame cameras. This combination of large aperture, fast focal ratio, and wide-field coverage is exceptional for capturing faint extended objects in remarkably short exposures.

Like all HyperStar systems, the C11 version replaces the removable Fastar secondary mirror, placing your camera at the front of the telescope. The short exposures and wide field make unguided imaging on alt-azimuth mounts entirely practical. One camera adapter (threaded for 2″ filters) is included.

Key Features

Converts Celestron 11″ SCT from f/10 to f/1.9 (25x faster)
Supports full-frame sensors up to 35mm diagonal
Coma-free, flat field of view up to 3.7°
Camera adapter threaded for 2″ filters included
Secondary mirror storage holder included
No spacers needed — adapter sets correct backfocus

Specifications

Focal Ratio	f/1.9
Telescope	Celestron 11″ SCT (Fastar-compatible)
Max Sensor Size	35mm diagonal (full-frame)
Field of View	Up to 3.7°
Filter Thread	2″ (on camera adapter)

Compatibility: Requires a Fastar-compatible Celestron 11″ SCT. Older C11 models without removable secondary can be upgraded with the HyperStar Conversion Kit for C11 (sold separately).

Explore these guides from our Astro Wiki to learn more about this type of equipment:

Focal Length & F-Ratio → Backfocus & Spacing → Field of View Explained →