Title: A helpful hint
Product review: This adaptor has the aperture stop down rim, which pushes in the small pin on the back of an m42 lens to allow the aperture blades to close as you move the aperture ring. For lenses which have the switch to move between M and A mode, this is entirely unecessary, and can even become a problem with some lenses. I know that the Pentax Super Takumar 50mm f/1.4 will have problems focusing to infinity on adaptors with this rim. Save yourself the trouble and find out without a rim.
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