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09-17-2012, 06:47 PM   #1
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M42 lens

So I just got a Meyer optik 50mm 1.8 for 50 dollars today and noticed it doesn't have a manual switch on it. My question is can I mod it somehow for it to auto stop down without depressing the pin in the back of the lens?

09-17-2012, 08:11 PM   #2
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I have heard of people super gluing the pin down, or using various things to hold it in. Read here:
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/51749-m42-auto...ification.html
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/101606-how-fix...anual-one.html
09-18-2012, 10:11 AM   #3
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I do a mod for lenses that do not have the switch, using a short price of pltic tubbing to block the pin in the depressed mode. The other option is to get an M42 adaptor that has a flange to depress the pin when mounted, although note these do not work with lenses made for the Spotmatic F or ES II which have a little bump on the bottom. (specifically SMC taks)

If I find the photo I posted of the mod I will put a link here. Note the tube is about 1/8 inch ling (3 mm for the imperial impared) and I find the end of a ballpoint pen refil to be the perfect material

09-20-2012, 09:10 PM   #4
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thanks guys, that was exactly what i was looking for. i was at work on my phone and google seemed to come up with nothing which was odd. but i also googled it at home and behold! all the answers lie there. thanks again.

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