I vaguely remember there was a problem either with Ricoh cameras or
Ricoh lenses back in film days. They used the K-mount bayonet, but there
was something they did different and either Ricoh lenses would get stuck
if you mounted them on a Pentax camera or Pentax lenses would get stuck
on Ricoh cameras.
I wish I remembered more specifically what the problem was, and I don't
know if this relates to Bob's problem, but I hope it might somehow help.
On 9/6/2022 11:35 AM, Godfrey DiGiorgi wrote:
Hi Bob!
Hmm. I'd seen some odd-ball Pentax lens mount stuff over the days when I was
mucking with a bunch of Pentax -M and -A lenses and adapters. Never had a
120mm, I'd be interested to see what the rear mounting flange looks like. I
know a couple of Pentax lenses had to have the diaphragm control lever modified
to fit one or another lens mount adapter out of the bunch that I had…
If the server kills your email if you embed a link, drop a line to my personal
email. :)
G
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Godfrey DiGiorgi - godfreydigio...@me.com
On Sep 5, 2022, at 7:12 AM, Bob Pdml <pdm...@hotmail.com> wrote:
Well, two strange things really.
First is an on-topic message from me.
Second is an oddity with a Pentax-M 120mm f2.8 lens that I have.
If anyone here has one of these, could you please compare the back of it with
your other M lenses?
I have been doing some informal ‘shoot outs’ with my Pentax-M lenses and my
Leica lenses, and will put them online if anyone is interested. Anyway, I have
been using my Leica M10 monochrome body for all the shots, and a Novoflex
adapter for the Pentax lenses, without any problems.
Except that the 120mm lens doesn’t fit the adapter.
On closer inspection, the bit at the back (sorry for the technical jargon) of
the 120mm lens where the aperture levers are is significantly different from
the other lenses. The photos at this link show you. The 120mm is on the left;
the other lens is a 135mm, which is about the same size.
(A link to some pictures should go here, but the server keeps rejecting my
emails with links. I’ll try to find another way of showing the pictures).
On the 135mm and other lenses there are some concentric grooves at the back,
and it is stepped down. The 120mm is plain, and doesn’t have the step.
On the adapter there is a flange which goes down into the dropped part of the
step when you put a lens on, and of course it can’t do this on the plain back
end of the 120mm, so the adapter won’t go on the lens.
The lens fits my Pentax MX fine, as well as a number of other MXes I’ve been
evaluating with a view to buying a new one. As far as I know it doesn’t affect
anything when shooting. However, I need to test this lens specifically as any
problems it causes may have become mixed up with problems which have caused me
to reject other cameras.
It’s possible that someone has had the lens altered for some reason, although
it is otherwise mint-, but it looks almost like a KF mount.
Anybody else have one like this?
Thanks,
Bob
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