Celestron SCT to 2" Visual Back Adapter
Unlock the full potential of your Schmidt-Cassegrain or Maksutov-Cassegrain telescope
If you've been limited to 1.25" accessories on your SCT or Mak, it’s time to give your telescope a performance boost. The Celestron SCT to 2" Visual Back Adapter replaces the standard 1.25" visual back on most Celestron and compatible telescopes, opening the door to a wider world of 2" diagonals, eyepieces, and imaging accessories.
Say Hello to Bigger, Brighter Views
Using 2" accessories allows you to take full advantage of wide-field eyepieces and premium optics that simply don’t fit in a 1.25" system. With this adapter installed, you can connect a 2" star diagonal and enjoy sweeping views of star clusters, large nebulae, and rich star fields that would otherwise be vignetted or cropped. It’s a small upgrade that can make a big difference—especially for visual observers who crave immersive views.
Precision Fit with Secure Compression Lock
This visual back threads directly onto the rear cell of your SCT or Maksutov-Cassegrain telescope. It’s compatible with all standard SCT rear threads (like those on the C6, C8, C9.25, C11, and C14). Once installed, the 2" end accepts any standard 2" diagonal, eyepiece, or photo accessory.
To protect your gear and maintain optimal optical alignment, the adapter features a brass compression ring. Instead of relying on metal set screws that can scratch or tilt your accessories, the ring evenly grips the barrel with a twist of the thumbscrew—keeping everything firmly centered and mar-free.
Built to Last, Designed for the Field
The body of the adapter is machined from aluminum and anodized black, both for durability and for reducing unwanted reflections. Internally, the surfaces are glare-threaded and painted matte black to preserve contrast—especially important when observing the Moon, planets, or bright stars.
Whether you're upgrading your diagonal, expanding your eyepiece collection, or attaching a camera for imaging, this adapter provides a solid and reliable interface between your telescope and your favorite 2" accessories.
Observing Tip:
Wide-field 2" eyepieces, like a 30mm or 40mm Plössl, reveal sprawling star clusters and richly populated Milky Way vistas that 1.25" formats simply can’t match. This visual back is your ticket to the big sky experience—don’t forget to add a matching 2" diagonal to complete the upgrade.
Final Thoughts
The Celestron SCT to 2" Visual Back Adapter is an easy, affordable, and practical upgrade for any SCT or Mak owner. It expands your accessory options, improves your viewing experience, and provides a sturdy platform for both visual and photographic use. Simple to install, built to last, and precision-machined for performance—this adapter is one of those “why didn’t I do this sooner?” accessories.
