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| p.1 #4 · C/Y: what do I grind down? |
The fin will be at the 12:00 position when looking at the back of the lens with the DOF scale also at the 12:00 position.
You probably don't have to remove much, file it at an angle so the length doesn't change, so it might me still used on a C/Y body.
You should be able to see how much needs to come off by turning the focus after the mirror is hung from infinity to the point it doesn't hang, it's best to file some, test it, file some more, test it, & repeat.