jcolwell
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 p.1 #2 · Adapting Pentax K lens to Canon EOS | |
Lotusm50 wrote:
To adapt a Pentax K mount lens to Canon full frame, you need an adapter and to trim off the aperture control lever from the K lens mount.
You don't have to remove the aperture control lever for a 1.6x CF body. You do have to remove it for a FF body. I'm not sure if you need to do it for a 1.3x CF body (but I can check at home tonight).
Lotusm50 wrote:
However, if you ever wanted to use the lens (particularly, an older one) on a future Pentax or Samsung DSLR (supposedly several in the works according to a Japanese investment analyst report) you are out of luck.
In this recent thread: http://www.fredmiranda.com/forum/topic/694185/0#6245645, mawz pointed out that -A and more recent lenses (with electronic contacts), were a problem with Pentax DSLR bodies, but earlier Pentax K-mount lenses (i.e. -M and "plain K" lenses) are still completely useful on Pentax DSLR.
Lotusm50 wrote:
Instead (and hopefully I've got this right), how difficult is it to just open the lens mount and remove the aperture lever, and save it for later, just in case you might need it? I'm this is going to be different for different K-mount lens across different manufacturers, but should this be easily do-able?
It depends on the lens. On my SMC Pentax 18mm f/3.5, the aperture control lever is one continuous part (albeit, very bendy) all the way from the offending lever to the diaphragm itself. On this lens, removing the aperture lever would disable the diaphragm, so I cut it off.
Generally, it's not difficult to take off the mount ring and base cover (if the lens has one). Then you can have a closer look at the aperture control lever to see if it is a simple job to remove it (as it is on some lenses), or if it extends further into the lens body. In the latter case, you're on your own. I've opened and successfully closed many Pentax and third party K-mount lenses, right down to the aperture blades (and beyond), but there's a few in a drawer that weren't so easy to put back together. I'm confident that they could be reassembled by a repair pro, but that would cost more than getting another copy of the lenses in question.
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