Yet another question please. I promise not to speak again for a while..
Amongst my various screw mount Pentax lenses is a Vivitar 28mm f2.8 lens
which at first sight looks like a Pentax screw mount. Yet when you screw it
in it stops about 20 degrees short. In other words the diaphragm activating
pin stops about 4 o'clock on the camera flange so that it cannot be stopped
down by the camera stop down mechanism.
Now I've looked at it from every angle I can, even dismantled it but there
is just no way one can adjust or re-set the thread. Does anyone on this
list know whether there is a similar thread which almost but not quite
matches the M42 thread?
Conrad F. Samuels
Kirstenhof RSA
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