Yep, that has to be different.
I did remember a couple of cases of a "different" M42 in the photo
world - an early Adaptall type mount that is M42 x .75 and also a
Schneider Componon enlarging lens that used an M42 x .75 retaining
ring. Earlier and later versions of the same lens were different sizes
(M39 and M50) which caused me much confusion. The Adaptall thread was
the one that connected the various lens mounts to the lens rather than
the lens to the camera.
Paul
The tool page he reference was M42-5 not M42-1
JC O'Connell
hifis...@gate.net
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