You can use K Mount on eos full frame but...to use Pentax lenses on full frame you must perform a "leverectomy"
Which I find foolish. Why grind or cut off the aperture levers and shield off a perfectly good pentax lens? But I read of many who do at fredmiranda alternate gear forum. Popular pentax leverectomys are SMC 200mm 2.5 , F 300mm f4.5 , 85mm 1.4 SMC-A , all film era FA Limiteds like the 77mm 1.8, 50mm 1.2 SMC-A, ouch ouch ouch!!!! I'd never do that, it just seems very wrong.
However if one wanted to use Canon aps-c instead of Pentax aps-c then no leverectomy is required. Big mirror requires clearence that the small mirror does not. But I'd say Pentax aps-c is better to use pentax glass with than a canon aps-c so its a pointless to buy a crop canon to use Pentax K Mount glass with. Now screw mount is another thing entirely. No mods on any canon bods and put an adapter on each m42 and you magically make it bayonet onto eos. Simplier to use instead of screwing and screwing and screwing on the lens. Adapters run about $7.50 each.
Originally posted by stanleyk Samsungian,
You seem to know a lot about Cannon cameras. Here's my question, my understanding is you can use K mount lenses on them. How does that work and what are the drawbacks.
Thanks!