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Originally Posted by Mr Guy
1) SMC Pentax-M 50mm looks like f22-f1.7
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#7 on
this list of best 50mm lenses ever made? (The current 50mm f/1.4 comes in at #8).
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Originally Posted by Mr Guy
2) A TAMARON converter labeled, "Tele Converter 2x For Pentax-K"
3) One labeled "Auto SEARS MUTLICOATED 28mm" model No 830702966 looks like f22 - f2.8
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These I don't know anything about, but I've heard good things about Sears-badged lenses from back when Sears was in its heyday.
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4) Finally, the big one, Albinar-ADG 77-300mm f32-f5.6
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No idea, but f/5.6 maximum aperture is pretty slow.
If they do work, will there likely be any trade offs besides manually focusing?
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Yes, there's another disadvantage. The camera bodies have no way of sensing the aperture ring's setting, so lenses without an A setting (like these) only meter when you press a button at anything but wide open. That takes some getting used to.