Shim stock. Available at good auto parts stores here in sizes from .001-inch to at least .005-inch. Cut to fit the lens flange until you've backed it up 10 hours to the 12 o'clock position.
Paul via phone > On Feb 23, 2017, at 3:13 PM, Steve Cottrell <[email protected]> wrote: > > Okay, here's an interesting question. > > Pentax lens - to - other makes of camera adaptor rings. They're out > there. Cheapies off eekBay and Amazon, and one or two decent makes. > > Here's the problem. My son uses the A*85/1.4 on his Canon C100 video > camera a lot. He loves the creamy bokeh and minimal depth of field it > offers, and it does look fantastic with HD video. I got a rubbish > adaptor for him to use because the special mounts I had made years ago > need longer screws and I can't be arsed to find the thread type and > figure out the size so he could use that. > > Instead, the cheap adaptors work okay, except they don't work very well > at keeping the lens from rotating on the adaptor. The locking screws > basically don't. I've hacked and slashed to try and make them lock > better but without precision drill parts and miniscule tap and die sets, > it's a pain. > > I got one of these: > > <http://srb-photographic.co.uk/canon-eos-camera-to-pentax-k-lens- > adaptor-10704-p.asp> > > <http://tinyurl.com/hs4mhal> > > and it's fine, but it exhibits one issue that all these bloody things do > - they orientate the lens so that what should be top dead centre of the > lens (at 12 o'clock) is out a bit and set at 2 o'clock. The reason for > this is to stop interference by the lens's actuator arm - it sticks out > into the throat of the camera and if not careful can damage said camera. > > Except our A*85/1.4 doesn't actually have this actuator as I sliced it > off years ago! > > You'd think that modifying an adaptor to be able to rotate the lens a > bit more round on the adaptor would be easy - far from it. The > tolerances are minimal in that flanges start interfering with each other > and once you get the damned thing lined up properly there's not enough > grip, or it wobbles and God knows what. > > So we could use an adaptor that orientates the lens at 12 o'clock with > no fear of damage to the camera. Does anyone know of any adaptor that > allows this? > > > Dangerous asking you lot for suggestions. Sessoms you can keep quiet for > starters! > > > -- > > > Cheers, > Cotty > > > ___/\__ Broadcast, Corporate, > || (O) | Web Video Production > ---------- <www.seeingeye.tv> > _____________________________ > > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
