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Anonymous
Two radically different focal lengths. Do you want a wide (20mm) or a medium tele (50mm)?
If you're not sure, split the difference and probably come out on top with a normal, either a 28, 30, or 35mm. It has approximately the same perspective as human vision, so it looks very natural and is easy to compose with. It's an intermediate length, usable for pretty much everything.
>>191209 The other guy is right. Pentax has pretty much never made anything but a great 50/1.4, but the ones it made for the M42 Screwmount ("Takumar" will be in the name) are considered some of the best lenses ever made for 135-format photography, on par with Leica, Zeiss, etc. Supposedly, the absolute best of these is the one that reads "Super-Multi-Coated Takumar" on the lens, but they're all awesome.
It's manual-focus only. Shouldn't bother you, but some people insist on autofocus, so you should know. You'll have to buy a cheap adapter, just a little piece of metal that hooks it to your K-mount camera. Except for that, if it's in good condition it'll work just like a new lens.
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