Uncompromised Full-Frame Astrophotography for Nikon Cameras
The Orion Superwide 50.8 mm (2 in) Prime Focus Adapter for Nikon Cameras (ORI-05641) is designed to eliminate optical bottlenecks in DSLR astrophotography setups. Traditional T-adapters rely on a 42 mm (1.65 in) T-thread system that chokes the light path, leading to visible vignetting (dark corners) on full-frame and APS-C camera sensors. By providing an expanded clear aperture of 47.4 mm (1.87 in)—nearly 10 mm wider than standard solutions—this adapter ensures maximum light transmission across your entire image sensor.
Integrated One-Piece Bayonet Design
Instead of stacking a separate T-ring onto a T-adapter, the Orion Superwide integrates a 50.8 mm (2 in) nosepiece barrel directly with a precision Nikon F-mount bayonet. This unified construction increases physical stability, minimizes flexure, and keeps back-focus usage to a minimal 10 mm (0.39 in).
Furthermore, the 50.8 mm (2 in) barrel features a tapered safety groove. If the thumbscrews on your telescope's focuser collar accidentally loosen during long tracking sessions, the safety recess catches the screws and prevents your expensive camera setup from sliding out.
47.4 mm Clear Aperture
Maximized light throughput for vibrant, unvignetted astro-images.
Anti-Glare Threaded Interior
Machined from black anodized aluminum with internal glare-reducing threads and a flat-black finish to suppress internal stray light and maximize image contrast.
50.8 mm (2 in) Filter Compatibility
The front nosepiece is threaded internally to accept standard 50.8 mm (2 in) astronomy filters, allowing seamless connection of light-pollution or broadband filters.
Technical Specifications
| Property | Specification Details |
|---|---|
| Product Name | Orion Superwide 50.8 mm (2 in) Prime Focus Adapter for Nikon Cameras |
| SKU Number | 05641 |
| Side A Connector Type | 50.8 mm (2 in) Telescope Focuser Barrel |
| Side B Connector Type | Nikon F-Mount Bayonet |
| Clear Aperture | 47.4 mm (1.87 in) |
| Optical Extension / Back-Focus Length | 10 mm (0.39 in) |
| Net Weight | 39.7 g (1.4 oz) |
| Construction Material | Machined Aircraft Aluminum (Black Anodized) |
| Stray Light Control | Internal glare threads with matte flat-black anodized finish |
| 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 Nikon F-mount DSLR cameras (APS-C and Full-Frame FX sensors like D850, D750, D500, D7500, etc.).
- Compatible Telescopes: Any telescope equipped with a standard 50.8 mm (2 in) focuser collar or drawtube.
- Mirrorless Note: Nikon Z-series mirrorless cameras require an additional FTZ or FTZ II mount adapter.
Step-by-Step Attachment
- Align the mounting index dot on the adapter's bayonet with the alignment dot on your Nikon camera body.
- Twist the adapter counterclockwise until it clicks securely into place, just like attaching a camera lens.
- Optionally, thread any standard 50.8 mm (2 in) astronomy filter onto the front nosepiece threads.
- Insert the 50.8 mm (2 in) barrel into your telescope's focuser drawtube and tighten the locking thumbscrews firmly.
Frequently Asked Questions
| Brand | Orion |