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04-12-2011, 06:06 PM   #1
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How well do M42 lenses work on K mount pentax cameras?

Maybe I should consider the M42 lenses becasue there are so many adapters for various cameras? I heard I could even use these lenses on Nikons

04-12-2011, 06:17 PM   #2
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They work just like any other lens- here are the instructions: https://www.pentaxforums.com/forums/pentax-lens-articles/110657-how-use-manua...7-k-x-etc.html

The adapter is "lossless" if you will.

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04-12-2011, 06:18 PM   #3
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M42 lenses can not be used on Nikon without optical correction. Without optical correction you lose infinity focus.

You can use M42 without optical correction on Pentax, Yashica/Contax, Minolta MD, Minolta A, Konica, Canon FD, Canon EF, 4/3, m4/3, Sony NEX...anything with a registration distance of 45.5mm or less.
04-12-2011, 07:21 PM   #4
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Wow, so should I just be investing in M42 lenses? I am just starting.. bought a few K-mount lenses but I can sell them.

I have the Pentax-M 50mm/f1.4 , Pentax K 55mm/f1.8 and the Pentax K 35mm/f3.5

04-12-2011, 07:57 PM   #5
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QuoteOriginally posted by geekette Quote
Wow, so should I just be investing in M42 lenses? I am just starting.. bought a few K-mount lenses but I can sell them.

I have the Pentax-M 50mm/f1.4 , Pentax K 55mm/f1.8 and the Pentax K 35mm/f3.5
K-mount lenses can be adapted to many of the same cameras.

Your current collection contains some great glass.


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04-12-2011, 08:34 PM   #6
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There are lots of great M42 lenses, I am loving my SMC takumars 28mm/55mm/200mm and a 2X Teleconverter. I'm having focal point issues with the K-5's viewfinder.. but that is not the fault of the lens. For great IQ I would take my SMC Tak's over my DA 18-135mm any day!
04-13-2011, 03:20 AM   #7
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Gee, I assumed this question was about M42 on K Film cameras.

My experience is that the M42 thing is actually better on all the manual focus Pentax cameras, as these meter better and more reliably than the dSLRs when used this way. In fact, throw one on an aperture priority Pentax, and except for having to stop down by hand, you're good to go!
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