Hello --
I've just had an encounter with a lens whose mount had a countersunk screw
head in the region likely to do damage to the little rubber bump on the
OM-4T mount (A Samyung/Phoenix 18-28 f/4 zoom), and decided to figure out
just what the keep-out (for screw heads) might be. Working from an image in
the e-SIF, I came up with an angular sector of 100 degrees clockwise from
the top or focus index of the lens (looking at the back end of the lens in
question). This may be a little generous, but I wanted a safe
metric. This seems reasonable given the 70 degree engagement twist of the
OM mount, and about 30 degrees between the red bayonet index mark on the
face of the mount and the 'little black bump'.... I've made myself a simple
circular template with a 100 degree wedge removed that I can carry around
to various potential OM Lens sources for easy assessment; I understand that
the offending screw holes can be filled with epoxy, but this simple
template at least lets me know if a particular buy comes with a little
added work required!
Can anyone confirm or refute my measurements and analysis? Thanx!
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