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02-12-2011, 10:24 AM   #1
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Converting a lens

does ony one know how to convert an olympus om-system zuiko mc auto-s 1:1.8 f=50mm to k mount ??

02-12-2011, 10:33 AM   #2
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QuoteOriginally posted by lguckert79 Quote
does ony one know how to convert an olympus om-system zuiko mc auto-s 1:1.8 f=50mm to k mount ??
Get a new mount from leitax and Bob's yer uncle.
02-12-2011, 11:15 AM   #3
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do you have a link
02-12-2011, 11:25 AM   #4
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Leitax.com

02-12-2011, 01:05 PM   #5
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I have modded two OM lenses, and two other similar C/Y lenses, to PK use. Simple, easy, cheap. The problem is that the bayonet flags on an OM or C/Y lens base are just a little too thick to fit under the PK mount lugs. So, I tapered those flags so they DO slide in. Here's what I wrote about my first conversion, a Vivitar 35/2.8:
I used a Dremel cutting blade that had already been worn down from cutting other metal parts. I used its edge and side to taper the tops of the leading edges of the lens' bayonet blades.

Definitions: By 'top' I mean the surface that's AWAY from the camera; and by "leading edge" I mean the part that first engages with the blades on a PK mount. By 'taper' I mean I changed that leading edge from blunt to wedge-shaped.

The blades on this lens are about 1mm thick. With the cutting tool, I reduced the thickness at each leading edge to about 0.5mm, and tapered it back about 8mm. I have no OM body (yet) to test this on, but it looks as though it should still fit firmly onto an OM body. But I also removed the mount-grip gear and the aperture flags (in the way on a PK mount) so if this ever sees an OM again it'll be totally manual and unsecured.
With that mod, the OM lens can be force-fit onto a PK mount. If you want more security, use the dremel blade to cut a slot (1mm wide and deep, 5mm long) into the lens base for the PK locking pin to slide into. That will secure the lens on the body.
02-12-2011, 05:10 PM   #6
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Remind me to never buy a used lens from RioRico !
02-13-2011, 12:38 PM   #7
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Thought I had a link for OM conversions...guess not. I know there's a thread out there, somewhere...

It comes down to: Do you want to modify each lens, or modify the camera? Someday I plan to pick up another body and do the latter to have a full-time non-Pentax mount camera, like so Adaptation d'objectifs via des bagues [Topic Unique] - Page : 10 - Objectif - Photo numérique - FORUM HardWare.fr
02-13-2011, 04:12 PM   #8
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QuoteOriginally posted by Lloydy Quote
Remind me to never buy a used lens from RioRico !
Hay hay hay!!! When I chop a lens and then sell it, I reveal *everything* (except my shoe size). So far I've only listed two chopped lenses -- and they both sold for good profits. (My USA shoe size is 18.) I may have another chop-job up in a couple weeks, a Rokkor 45/2.8. That's if I can ever reassemble it...

[/me gazes in despair at box filled with tiny parts that were a HiMatic only yesterday]

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