Celestron Large SCT & EdgeHD Adapter V2 for Off-Axis Guider (#93566)
Optimized back-focus and full-frame illumination—no extra spacers required.
If you’re pairing a large-format DSLR or dedicated astronomy camera with Celestron’s Off-Axis Guider (OAG), this custom adapter is your key to unlocking full-frame performance from your 9.25", 11", or 14" Schmidt-Cassegrain or EdgeHD telescope. The updated Version 2 of the Large SCT & EdgeHD Adapter was purpose-built to deliver better spacing, a wider field of illumination, and higher contrast than ever before—all without the need for additional adapters or guesswork.
Tailored for Full-Frame Imaging
Full-frame sensors like those found in the Canon 5D and 6D demand a larger image circle to avoid vignetting and dark corners. The standard SCT/OAG setup simply doesn’t deliver enough light across the field. Enter the Large SCT & EdgeHD Adapter V2: its 63mm clear aperture provides a much larger illuminated field, making it the go-to solution for anyone using full-frame cameras or APS-C sensors who wants to take full advantage of the optics in a larger OTA.
No More Spacer Guesswork
One of the most useful updates in this Version 2 model is its extended 38mm optical path length, which helps meet the precise back-focus requirements of your telescope when combined with Celestron’s Off-Axis Guider. DSLR users in particular will appreciate the simplified setup—no extra spacers or adapters are needed to reach the proper imaging distance on most systems. It’s a cleaner, more secure imaging train that reduces flexure and enhances performance.
Built to Perform—Inside and Out
This isn’t just another threaded ring. The Large SCT & EdgeHD Adapter V2 is CNC-machined from black anodized aluminum with internal sandblasted surfaces to suppress internal reflections and stray light. The result? Maximum image contrast—critical when you’re chasing faint nebula detail or pulling out subtle features in galaxies. A finely knurled outer surface ensures a secure grip when threading or unthreading the adapter, even with gloved hands or in cold field conditions.
Key Features
-
Compatible with Celestron 9.25", 11", and 14" SCT and EdgeHD OTAs
-
Designed for use with Celestron’s Deluxe Off-Axis Guider (#93648)
-
Extended optical path length (38mm) accommodates DSLR back-focus
-
Ideal for full-frame cameras (e.g., Canon 5D/6D)
-
Sandblasted interior and black anodized body for high contrast
-
Knurled surface improves grip during installation/removal
Technical Specifications
-
Optical Path Length: 38mm (1.49")
-
Clear Aperture: 63mm (2.48")
-
Construction: CNC-machined aluminum, black anodized
-
Weight: 6 oz (170.1 g)
Final Thoughts
Whether you're fine-tuning your imaging train for maximum light throughput or simply tired of stacking spacers to reach the correct back-focus, this precision adapter is a smart upgrade. It simplifies setup, expands the usable field for your camera, and maintains optical integrity across the image plane—all while helping you pull in every photon your big SCT or EdgeHD can deliver. For OAG users working with full-frame cameras, it’s not just useful—it’s essential.
