Pentax K mount lens
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You can use these on asp-c Canon DSLRs and all Pentax SLRs. They are also usable on mirrorless cameras such as the Sony Nex, Samsung NX and Olympus / Panasonic micro 4/3rds.
You won't be able to mount them on Sony, Nikon or Sigma DLRs due to the register distance difference. You could use an adapter with a glass element but it will act as a mild teleconverter, affecting image quality and slowing the lens from its maximum aperture. You may be able to do some modification to the lens (replace the mount and adjust infinity focus etc.), but it would likely be a lot of hassle.
You won't be able to mount them on Sony, Nikon or Sigma DLRs due to the register distance difference. You could use an adapter with a glass element but it will act as a mild teleconverter, affecting image quality and slowing the lens from its maximum aperture. You may be able to do some modification to the lens (replace the mount and adjust infinity focus etc.), but it would likely be a lot of hassle.
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Found this website interesting it seems to explain the differences between the Pentax lenses.
http://www.mosphotos.com/PentaxLensesExplained.html
http://www.mosphotos.com/PentaxLensesExplained.html