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09-02-2012, 03:04 PM   #1
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Lens adapter help


I am new to DSLR's so know very little about lenses. What adapter, if any, do I need to fit this lens Prakticar Original 50mm f1.8 MC PB Bayonet Mount Fast Prime Lens 4654194 | eBay to my Pentax K-r?

Thank you for your help

09-02-2012, 03:15 PM   #2
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The registration distance is too close to Pentax K to allow for an adapter that retains infinity focus without optical correction, it is an uncommon mount so there are no adapters made at all. It can possibly be modified to fit, but it is not an easy task.

The older Pracktica screw mount lenses can easily be adapted with a standard M42 to K mount adapter.

Last edited by elliott; 09-02-2012 at 03:20 PM.
09-02-2012, 04:25 PM   #3
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Praktica Bayonet mount has a shorter register distance than PK/M42 mount lenses. You will need to shave down the lens barrel for the modification to succeed and retain infinity focus. Much more preferable to look for an M42 mount Prakticar lenses instead.
09-02-2012, 11:17 PM   #4
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Thank you for your help.



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