Leverectomy on Pentax K to mount it on Canon 5D : How to ?

[fourmix]

Hi,

I wonder how leverectomy on the K mount lenses are done ?
Is anybody have a tutorial for that ?
Is there a method to do that ?

I also read that "sepcial" adapter exists (Pk to Eos EF)
The PK lenses with this adapter are not "in line" but mounted on the 5D with a rotation in order to prevent mirror hits ? Is it real ?
Ware can i buy one ? (i saw on ebay, but i'm not sure at 100%)

Here the protusion problem:


Thanks for your attention

[martyn_bannister]

Hi Fourmix,

I have done this on a couple of lenses to try them out. I don't have details of which lenses, but can get them if you are interested. Essentially the same operations carried out on both. Both were pretty simple.

The shield was retained by three screws. Simply undid them and the shield can be lifted off. I put the screws back and tightended them so that they couldn't get lost.

The rear face of the lens was retained by four screws. Undid those and the rear face also lifts off. Had to be very careful, because there are sometimes one or even two springs inside here which can fly out. Even if you find them again, it's usually difficult to work out exactly where they go on re-assembly Another thing to be wary of is that the aperture ring is often held on by the rear face and, if the two come away together, there may be a detent ball and spring which are also easy to lose.

The lever was held on by two screws which can now be undone. The lever then lifts straight off. Again the screws were replaced and retightened so they couldn't get lost.

If you want I can supply details and pictures - can't guarantee a timescale though )

Good luck.

[fourmix]

Thanks for your experience.
Yep, pics would be apreciable, but don't worry, take the time to do it, i don't need to do that in the week

[AhamB]

[fourmix]

Thanks AhamB
So this would say i have no choice...

[AhamB]

You can always do destructive leverectomy, meaning just to cut off the lever and the shield, which is a bit easier but can cause metal dust/shavings in the lens if you are not careful. I did it using a Dremel, which was perhaps not such a good idea because of the high rotation speed of the cutting disk which makes the metal particles fly away at high speed. Next time I have to do something like this I will take a slower approach and do it by hand (with metal saw and/or file).

On my Vivitar 28/2.0 it's not possible to unscrew the shield, so you have to cut or grind that off (it's plastic so not difficult). The lens in your picture looks like a Vivitar with the same shield, so you have to cut that off.

I just noticed that my CZJ Pancolar 50/1.8 hits the mirror when focused at infinity, so I guess I need to give that one a small operation too...

When you decide to remove the mount to unscrew the lever, be sure that you have enough clean working space where small parts will not get lost. Don't do it over a wool carpet or something like that, where ball bearings/springs/ will be lost forever.

[fourmix]

Thanks AhamB


But really, i d'on't want to do destructive leverectomy on this:

[AhamB]

Heh, I can understand that.

[fourmix]

Interesting links here:
http://www.fredmiranda.com/forum/topic/667236/0

(Pentax limited's on 5D)

[fourmix]

[Spotmatic]

[fourmix]

One of the lens i want to modify is a Pentax K 50mm f/1.2
Cause even on Pentax, i will never need the lever to use this lens


On the german 31 limited/5D pics, we can see that the lens didn't turn.

[AhamB]

[cheve]