Celestron SCT to 2ft Adapter and T-Adapter - Secure 2ft Eyepiece

In this review the Celestron SCT to 2' Adapter and included T-Adapter is judged on build, fit, and usefulness for telescopes with Schmidt-Cassegrain or Maksutov-Cassegrain rear cells. It is best for amateur astronomers who want a simple, sturdy way to use standard 2' eyepieces, diagonals, or attach an SLR/DSLR for prime focus astrophotography. The single biggest reason to consider this adapter is its secure threaded connection to the telescope plus a brass compression ring that grips 2' accessories without scratching their barrels.

Key Features

• Threaded rear connection: Internal threads provide a secure, wobble-free attachment to the rear cell of most Schmidt-Cassegrain and Maksutov-Cassegrain telescopes for reliable alignment.
• 2' accessory compatibility: Replaces a 1.25' visual back so users can directly mount 2' eyepieces, diagonals, and other accessories to maximize the telescope's viewing potential.
• Brass compression ring: The brass compression ring holds 2' eyepieces and diagonals tightly without scratching or denting their barrels when the set screw is adjusted.
• T-Adapter for cameras: The included T-Adapter lets photographers attach an SLR or DSLR for prime focus astrophotography using T-threads and a camera-specific T-Ring.
• Machined aluminum finish: Precision machined aluminum construction with black anodized finish offers a durable, low-reflectance surface suitable for night use.

Who It's For

The adapter is aimed at backyard astronomers and hobbyist imagers who have a Schmidt-Cassegrain or Maksutov-Cassegrain telescope and want to upgrade from 1.25' accessories to full 2' eyepieces or attach a camera for prime focus work. Its solid threaded connection and compression ring make it a practical choice for users who value stability and minimal play when swapping accessories.

It is less suitable for someone who needs brand-specific custom threads built into their diagonal or for users expecting an out-of-the-box camera T-Ring, since camera-specific T-Rings are sold separately and some users report mixed fit behavior with certain 2' accessories.

Pros & Cons

Pros

• Secure threaded connection to SCT/Maksutov rear cells reduces wobble.
• Brass compression ring protects accessory barrels while holding them tightly.
• Includes a T-Adapter to accept camera T-Rings for prime focus imaging.
• Sturdy machined aluminum construction and black anodized finish resist wear.

Cons

• Some users report mixed fit with certain 2' accessories and minor issues inserting them.
• A single set screw and perceived screw thickness may feel minimal to those expecting heavier hardware.

Specifications

Our Verdict

The Celestron SCT to 2' Adapter with T-Adapter is a practical, well-built accessory for SCT and Maksutov users who want to use 2' eyepieces or try prime focus astrophotography. It offers strong value through a secure threaded connection and a protective brass compression ring, though buyers should be aware of occasional fit variance with some 2' accessories and that camera T-Rings are not included.

Frequently Asked Questions

Will this fit my Schmidt-Cassegrain telescope?
Yes; the adapter has internal threads designed to thread onto the rear cell of most Schmidt-Cassegrain and Maksutov-Cassegrain telescopes.

Can I attach my DSLR right away?
You can attach a camera via the T-Adapter, but you will need a camera brand specific T-Ring sold separately to connect your DSLR.

Will the adapter scratch my eyepiece barrels?
No; the brass compression ring is designed to grip 2' eyepieces tightly without scratching or denting their barrels.