Pentax Optio M40
Announced Jul 11, 2007 •
8 megapixels | 2.5″ screen | 36 – 108 mm (3×)
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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?