I started using M42 to Pk adapters almost since the Pk release, have
used the original version (more than one copy) in KM, K2, Ricoh XR10,
Lx, Mz5, PZ70, Pz1p and Mx, and never had infinity issues unless the
camera was off the spec somehow. Yes, that happened with the K2, and
later with the Lx.
The original adapter by Pentax was designed to remain in the camera
until a spring was pushed and the adapter released. I almost at once
fitted the adapter to the lens, removing the spring. Never had one of my
adapters stuck into the camera, have one that is shallower than the
others - if I screw it to the end on the lens, the combo will not fit
into the camera - any camera - so I have it spaced from the lens flange.
Works fine this way.
Here in BR some home-made adapters appeared lately, but they won't
focus to infinity - they place the lens farther from the camera. I'd
stick to original if possible, even spending some $15 extra.
At least one lens - russian made 55mm, can't remember exact model, had
to be adjusted - the lens had a small, almost cubic appendix that would
get too deep into the camera (Mx) so I removed it. And also made the
aperture blades closed by default, since the Mx wouldn't push the
auto-aperture pin.
Hope this helps,
lf
--
luiz felipe
luiz.felipe at luizfelipe.fot.br
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