simon_benton Posted May 28, 2005 Share Posted May 28, 2005 I recently purchased a Mamiya Pro S with back and 127mm C lens. I purchased this at a very cheap price in as is condition. Price included a spare body and same thing happens. Everything works perfectly except that the shutter only fires at one speed (about 1/25) even on time. Am I doing something silly or is this a mechanical problem I will have to have repaired? I am new to the Mamiya RB67 and any suggestions would be appreciated. Link to comment Share on other sites More sharing options...
paul ron Posted May 28, 2005 Share Posted May 28, 2005 Sounds like it's a lens CLA is needed but you'll have to try firing it off the body to be sure. Of course you know mounting and dismounting a lens you must cock the body and the lens first. With the lens off the body, press the silver pin at the 12'oclock position on the back of the lens, then rotate the 2 pins at the green dot. To re-cock the lens rotate the pins to the red dots. Go through all the speeds and try this a few times at all speeds. *if you have any more questions e-mail me at AUTOMAX1@JUNO.COM, Paul, NYC. The more you say, the less people listen. Link to comment Share on other sites More sharing options...
mag_miksch Posted May 28, 2005 Share Posted May 28, 2005 maybe the lens wasnt used for a longer time, just try to fire 20 or 30 times, sometimes this helps. Link to comment Share on other sites More sharing options...
disneyry Posted May 28, 2005 Share Posted May 28, 2005 I agree with trying to fire the lens for a bit. I've had the same problem, and it worked itself out. rd Link to comment Share on other sites More sharing options...
paul ron Posted May 29, 2005 Share Posted May 29, 2005 Yes, repetative firing sometimes cures the problem but it's only a bandaid on the infection. That may loosen the old lube but it will become an intermittent problem since not firing the lens for a couple days will just gunk it up again. It will become fussy about temperature as well. There is nothing like washing the entire shutter out to rid all the old lube and replacing it with the newer synthetics. Less outgassing, better temperature range and they don't creep like petroleum oils do over time. While having the shutter open on the bench, it may need to be adjusted since old lens parts do wear and springs do get weak from improper storage. ALl these contribute to the reliability of the lens. The more you say, the less people listen. Link to comment Share on other sites More sharing options...
simon_benton Posted May 29, 2005 Author Share Posted May 29, 2005 Thanks for all replies. It probably does need a CLA. Is this the kind of task I could do? I am familiar with fixing older large format Ilex, Compur, Alphax and Rapax shutters but have no experience with the more modern shutters. Any advice would be appreciated. Link to comment Share on other sites More sharing options...
paul ron Posted May 29, 2005 Share Posted May 29, 2005 Sure you can do it yourself, sounds like you've got some experiance under your belt. This lens is much easier than the cameras you listed and youy might even have the right stuff to do right in your collection. You'll need a good #00 crosspoint screwdriver, a 1.5mm flat screwdriver, a pint of white gas, the lubes are bought from MicroTools (I don't remember which ones, you'll need 2 types) and of course the instructions to dismantle the lens, which I can probably help you with. Where are you located? Otherwise buy me lunch and pay the round trip shipping, I can do it for you in an hour? Paul, NYC The more you say, the less people listen. Link to comment Share on other sites More sharing options...
simon_benton Posted May 29, 2005 Author Share Posted May 29, 2005 Hi Paul I would love to buy you lunch but I live in Ottawa, Canada - a bit too far to travel for lunch. Do you have instructions how to open and CLA the lens? I would be more than willing to reimburse any costs. Regards Simon Link to comment Share on other sites More sharing options...
paul ron Posted May 30, 2005 Share Posted May 30, 2005 E-Mail me at AUTOMAX1@JUNO.COM The more you say, the less people listen. Link to comment Share on other sites More sharing options...
dmarks Posted May 30, 2005 Share Posted May 30, 2005 I have to buy Paul a lunch and I live in Newfoundland.He's a very good guy to deal with and is more than willing to help whenever he can.Too bad there's not more people like Paul around. Link to comment Share on other sites More sharing options...
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