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Tried it. Not that good, although faily usable at apertures above 5.6 or so.
Could be useful if you have lots of cool fd lenses and want to shoot outdoors/ high iso.
Sure is tempting when you see things like this: http://www.bhphotovideo.com/c/produ..._Telephoto_80_200mm_f_4_0.html#specifications
M42 lenses don't need an optical adapter and are even cheaper than old Nikons. Look into Olympus OM lenses as well.Look at used nikons. They're pretty much just as good of a deal and you can use an adapter without glass in it.