Thursday, January 08, 2026

Experiment: Canon FD 300mm f2.8 with crayford focuser

I am selling this ancient self modified lens.

A sudden thought came to me, why not attach it directly to a crayford focuser?  It shouldn't be too difficult.

I have all the thread specifications, connecting adapters might not be too difficult to find.


I even removed the camera angle adjuster to test, but unfortunately, the focuser was a bit too long for infinity focus.

I believe that a short profile SCT focuser might work, and I actually have one.  Might try again later, I just treat it as a short break for me.

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