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?
h200
By: h200 (Oct 23, 2012)
Posted to: Open Talk
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Hi, I'm new to the forum so please be kind :-)My Friend needs to sell her camera because she is desperate for money but hasn't a clue what to charge for it...I have looked on the internet for her to see if I could get some guide prices but can't find any for sale so it would appear either these cameras were not very popular or so popular no one wants to sell them:-DCan anyone help with a price and please don't be nasty if the camera is not all that...I am only trying to help her as she is...
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