Not having a K-mount flange here it's a bit difficult for me to follow
your description about why the OM lens mount is colliding or bottoming
out somewhere. Perhaps a short OM extension tube can be filed, sawed or
otherwise hacked on the PK side such that it will fit the body.
Another solution is to use the OM lenses in reverse with a PK mount
reversing adapter. That way you only have to match filter threads and
not camera mounts. Several of these for sale on the bay. You could use
an OM to 4/3 or OM to EOS adapter on the mount of the reversed lens to
hold the aperture lever down.
Chuck Norcutt
Curt & Sally Hedman wrote:
> Okay, here's another "I'd like to use my OM glass on my (other brand
> DSLR)' thread... I'd like to be able to use some of my OM glass, such
> as the 135/4.5 macro, on my K10D... the registration distance doesn't
> bother me, as I do not care about focus at infinity, but I haven't
> been able to locate a simple mechanical bit to go between the two.
> However, in fiddling with an OM lens and a K-mount body, I notice
> that the OM bayonet actually 'fits' into the K mount... the bayonet
> lugs fit with the lens rotated about 120 degrees counterclockwise
> from the normal OM position, but the OM bayonet bottoms out on
> something about 1.5mm from the front surface of the K mount, and the
> lens cannot be rotated to engage the bayonet lugs with the mount
> lugs. I had noticed previously that a Pentax K rear lens cap works
> fine on an OM mount lens, when one I bought somewhere arrived with a
> K-mount rear cap on it, so I figured things (diameter, lug
> size/location) had to be close. Since an OM lens rear cap wont fit
> onto a K-mount lens, at least not easily, I surmise that the diameter
> of the central part of the OM bayonet is smaller than that of a
> K-mount bayonet... Anyway, if I could come up with a way to hold the
> lens against the K-mount, with optical axis aligned and stray light
> excluded, I think things would work on the K10D. I've thought a bit
> about getting some cheap extension tubes (one each K and OM version)
> and slicing and combining, but that would not take advantage of the
> OM bayonet fitting into the K-mount... but might be OK with the
> 135/4.5 macro + variable extension tube. Anyone have any thoughts,
> comments or suggestions?
>
> Curt
>
>
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