Microscope Adapter - M42 male to 1.25" barrel
Microscope Adapter - with male M42 (outer) thread and 1.25" (31.7mm) barrel
This adapter screws into the trinocular camera exit of the BTC BIM-12T-type or similar microscopes.
On the top of the item you can see the 1.25" barrel that will accept a projection photo eyepiece. At the bottom there is a male T-thread visible. This is to connect photographic dSLR cameras to a microscope with female M42 mount or similar applications. You would also need a brand specific T-ring to connect your camera.
Compatible with various microscopes, including BTC BIM-312T, BIM-313T Microscopes
Please note, the thumbscrew is included of course, but it was not screwed in when the picture was taken...