Canon Pentax Lens
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Which old Pentax lens mounts can be used on a Canon eos body via an adaptor, KA, m42, or screw mount?
I am looking to buy an old prime Pentax lens for my Rebel t1i because they are cheap (and aparently good quality) and I can use the aperture ring to control aperture during video recording, which is otherwise fully automatic.
i dont think you can put a k mount lens onto an eos mount lens [trust me, ive looked everywhere for documentation, i have a few lenses from my pentax film SLR] i think its because the distance from the pentax lens to the sensor is shorter than what canon's lenses are designed for, so an adaptor would push the lens further away where you need to bring the lens closer to the sensor [you could do some surgery on the lens]
but if you were able to get, or make an adaptor, you'd lose the ability to focus at infinity,
plus it would probably have to be manual focus and aperture,
nikon lenses would work with an adaptor because nikon lenses are are farther from the sensor than canon lenses so with the proper adapter you can use nikon lenses on a canon body, but not the other way around.
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