Canon EF to T2 (M42x0.75mm) Adapter
thingiverse
This adapter allows you to connect an EF lens to a T2 interface that has M42x0.75 female threads. This is specifically designed to connect a Canon lens to telescope camera through a filter wheel box. The flange to flange dimension is 28.5mm. P.S. There is a little hole in the side for alignment of the lens. You can put a piece of contrasting 1.75mm filament in there and cut it flush for a nice indicator.
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