Uncompromised Full-Frame Astrophotography Performance
The Orion Superwide 50.8 mm (2 in) Prime Focus Adapter for Canon EOS is engineered specifically to eliminate optical bottlenecks in DSLR astrophotography setups. Standard T-adapters rely on a 42 mm (1.65 in) thread system that restricts light flow and causes significant vignetting (edge darkening) on full-frame and APS-C camera sensors. By providing a generous clear aperture of 47.5 mm (1.87 in)—nearly 10 mm wider than conventional adapters—this unit ensures full light illumination across your entire image sensor.
Integrated Design with Enhanced Safety
Instead of requiring two separate components (a T-ring and a T-adapter), the Orion Superwide integrates a 50.8 mm (2 in) barrel directly with a precision Canon EOS bayonet mount. This single-piece design increases mechanical stability, minimizes flexure, and keeps back-focus usage to a minimal 10 mm (0.39 in).
Additionally, the 50.8 mm (2 in) barrel features an extra-secure tapered relief cut. If the thumbscrews on your telescope's focuser collar happen to loosen slightly during long imaging sessions, the tapered safety groove catches the screws, preventing your camera equipment from slipping off.
47.5 mm Clear Aperture
Maximized light throughput for clean, unvignetted deep-sky exposures.
Anti-Glare Interior Finish
Features precision internal glare threads combined with a flat-black anodized finish to absorb internal reflections and maximize contrast in astro-images.
50.8 mm (2 in) Filter Compatibility
The front nosepiece is threaded internally to accept standard 50.8 mm (2 in) filters, allowing easy insertion of light-pollution or nebula filters.
Technical Specifications
| Property | Value / Specification |
|---|---|
| Product Name | Orion Superwide 50.8 mm (2 in) Prime Focus Adapter for Canon EOS |
| SKU Number | ORI-05640 |
| Side A Connector Type | 50.8 mm (2 in) Telescope Focuser Barrel |
| Side B Connector Type | Canon EOS Bayonet Mount (EF / EF-S) |
| Clear Aperture | 47.5 mm (1.87 in) |
| Optical Extension / Back-Focus Length | 10 mm (0.39 in) |
| Net Weight | 62.4 g (2.2 oz) |
| Construction Material | Machined Aircraft Aluminum (Black Anodized) |
| Internal Reflection Control | Glare-reducing threads and matte flat-black interior |
| Filter Threading | Threaded for standard 50.8 mm (2 in) astronomy filters (M48 x 0.75 mm) |
Compatibility & Installation Guide
Camera & Telescope Compatibility
- Compatible Cameras: All Canon EOS DSLR cameras (Full-Frame & APS-C sensors with EF/EF-S lens mounts).
- Compatible Telescopes: Any telescope equipped with a standard 50.8 mm (2 in) focuser collar or drawtube.
- Note: Canon EOS R/RP/R5/R6 mirrorless cameras require an additional RF-to-EF adapter.
Step-by-Step Attachment
- Align the red index dot on the adapter's bayonet with the red alignment mark on your Canon EOS camera body.
- Twist the adapter counterclockwise until it securely clicks into place, just like mounting a camera lens.
- Optionally, thread any standard 50.8 mm (2 in) filter onto the front barrel threads of the adapter.
- Insert the 50.8 mm (2 in) barrel into your telescope's focuser drawtube and tighten the locking thumbscrews securely.