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Post Info TOPIC: T-mount filter


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T-mount filter

How to use 1.25" (31.7mm) filters in a T-adapter.

Picture 191Picture 187
 Use a barrel from a Barlow lens or eyepiece Fit barrel into eyepiece holder. The eyepiece attachment has M42 threads.
Note: The Skywatcher Barlow lens has M42 threads to directly attach it to a camera adaptor. (the Barlow lenses have been completely removed)
Picture 186

Note: Eyepiece holder has been disassembled and reverse mounted.


Remove locking screw (if too long to fit into telescope draw-tube) on T-adapter.

(To hold barrel in place use a piece of plastic, or glue in place.)

 The Camera is fitted with an adaptor with male 42×0.75 thread (M42).
Picture 185Camera can now be fitted into telescope.

T-adapter now fitted into camera T-mount adaptor.

Filters can be fitted into the (hidden) Barlow barrel.


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