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Like thread title asks reason is I have a Pentax MZ50 film DSLR with two lenses but at a loss with what to do with them 
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Most old Pentax lenses are compatible with Pentax DLSR's , you just need to set to manual on the camera and (obviously) do the focusing yourself.
No they are both Pentax
All K-mount lenses will work. All M42 lenses will work with an adapter (since there are no mechanics at play). As far as I know the Pentax-A lenses will even let you do Av mode (although still manual focus).
Then you'll be fine. The only catch is their modern lenses (the DA variety) are not backwards compatible with film bodies, for the same reason that Canon's EF-S lenses don't work on the full frame bodies. The older bodies (K100D non-Super and older) don't support the SDM motors (same thing as USM/HSM/SWM) either.
I don't need the lenses was trying to see if there was anyone here who might "want" them or were I could try sell them, I have a Nikon now so the lenses are just sitting there
Aah right, I misunderstood. Let us know what you have. I *may* be interested.
A Pentax SMC PENTAX FA 1:4.5-5.6 100-300mm
SMC PENTAX-FA 1:4-5.6 35-80mm
If you had any fast primes I would have been interested.![]()
I got a 50mm prime Pentax lens but Its manual focus - think its a F1.4 - takes great pics and you can use the focus led indicator in the viewfinder to help with focusing.
Don't use it much but its not worth selling to you sorry..![]()
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Got a Pentax K10 digital camera with the standard lens.
Would these lense offer my anything better?