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The JMI Telescopes 2" SCT Adapter with 2" Female Output is made to allow catadioptric telescopes with standard 2" SCT threading to accept standard, unthreaded 2" push-fit diagonals, eyepieces, and accessories. It is often referred to as a 'visual back', and often comes standard with telescopes.
On the 'front' (where light would enter) there is a female 2" SCT threading, and upon the rear (where light would exit) there is a barrel with a 2" inner diameter and a pair of set screws to affix your 2" accessory.
When using a visual back alternatively with and without a diagonal, it may be necessary to add a JMI Extension Tube.
Adapts catadioptric scopes with 2" SCT male threadings to accept 2" accessories