How to Attach a Zeiss Biotar 58/2 Mount to NEX-7?

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okieisaak
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How to Attach a Zeiss Biotar 58/2 Mount to NEX-7?
10 months ago

I bought this lens on eBay recently and I'm trying to attach it to my NEX-7.  But I don't know if I need an M42 or M40 mount?  It is the 17 blade aperture Biotar.  This lens probably came off of an old Praktiflex.

Here's the link to the auction.

http://r.ebay.com/QeL5hv

Or maybe I can just buy a 40mm to 42mm filter adapter and then get an M42 to NEX adapter???

Is that what M42 stands for 42mm?

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Pentax Optio M40 Sony Alpha NEX-7
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