Lumicon · SCT Rear Cell → 2" Visual Back
Screws onto the back of a Schmidt-Cassegrain and converts the SCT rear-cell thread to a standard 2" visual back.
The Lumicon SCT-to-2" Adapter threads directly onto the rear cell of a Schmidt-Cassegrain telescope — the standard SCT male thread (2" × 24 tpi) — and presents a 2" holder on the eyepiece side. That turns the bare SCT thread into a familiar 2" visual back, ready to accept a 2" star diagonal, 2" eyepieces, or a 2" prime focus camera adapter.
Specifications
Telescope side
SCT female thread — screws onto an SCT rear cell (2" × 24 tpi male)
Accessory side
2" eyepiece holder
Overall length
1.5"
How it connects
SCT rear cell → SCT-to-2" adapter → 2" diagonal, eyepiece, or camera adapter
Frequently Asked Questions
What does this adapter do?
It screws onto the rear cell of a Schmidt-Cassegrain telescope, which has a male SCT thread (2" × 24 tpi), and gives you a standard 2" holder. From there you can attach a 2" star diagonal, 2" eyepieces, or a 2" prime focus adapter for a camera.
Will it fit my SCT?
It fits any telescope with the standard SCT rear-cell thread (2" × 24 tpi), which is used across most Celestron and Meade Schmidt-Cassegrains. Some larger scopes (such as 11" and 14" models) use a larger rear-cell thread and need a different adapter.
How is the Short version different?
This is the compact (1.5" overall length) version. A shorter adapter keeps the eyepiece or diagonal closer to the telescope, which helps when you need to conserve back-focus to reach focus.
Setting up your SCT?
Browse the full range of visual and imaging adapters to connect diagonals, eyepieces, and cameras to your telescope.
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