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Forum: Pentax SLR Lens Discussion 02-07-2019, 05:14 AM  
Orestor 100/2,8 on Pentax KP
Posted By Lowell Goudge
Replies: 5
Views: 1,010
See the mod below I did to a tamron adaptall M42 adaptor



All it needs is a small tube, about 2.5-3mm long between the mount and the internal apature mechanism.

My zenit 16mm fisheye is the same.

I use a section of a ballpoint pen refil. Put a slice on one side down the length, press the aperture pin down, and then slip the tube over the pin

Works like a charm
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