> On Sep 7, 2022, at 2:38 PM, John Sessoms <jsessoms...@nc.rr.com> wrote: > > 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.
There was a pin on Ricoh lenses that would catch on something on a Pentax body and you wouldn’t be able to take the lens off the body. > > > 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 >> — >> 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 >> -- >> %(real_name)s Pentax-Discuss Mail List >> To unsubscribe send an email to pdml-le...@pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. > > -- > Vivere in aeternum aut mori conatur > > -- > This email has been checked for viruses by AVG antivirus software. > www.avg.com > -- > %(real_name)s Pentax-Discuss Mail List > To unsubscribe send an email to pdml-le...@pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- Larry Colen l...@red4est.com. sent from ret4est -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
