mark liddell Posted August 11, 2006 Share Posted August 11, 2006 I have just got hold of the kirk QR plate for my RB67 which uses the two tiny holes on the base of the camera (http://www.kirkphoto.com/PZ34.jpg). Purley out of curiosity, is this what these holes were designed for? Link to comment Share on other sites More sharing options...
William Kahn Posted August 11, 2006 Share Posted August 11, 2006 Probably to keep the camera body from twisting on the plate. Link to comment Share on other sites More sharing options...
doc_w Posted August 11, 2006 Share Posted August 11, 2006 The Mamiya left hand grip/flash mount with shutter release fits into the three holes in the bottom plate. The centre hole is the normal screw mount. The hand grip has two pins that fit in the other holes, and these keep the camera from twisting out of alignment while mounted. By pure coincidence, I have one available. I don't use it anymore. I was thinking of putting it on ebay, but if anyone here is interested, let me know. Link to comment Share on other sites More sharing options...
eric friedemann Posted August 11, 2006 Share Posted August 11, 2006 Yes, the holes are designed for anti-twist pins on grips. Link to comment Share on other sites More sharing options...
pavelp Posted August 11, 2006 Share Posted August 11, 2006 Those holes are moisture drain channels. When the 7x7 mirror moves up, it compresses the air in the camera, all moisture condensates quickly and has to be drained out. Link to comment Share on other sites More sharing options...
peter_gilbert3 Posted August 11, 2006 Share Posted August 11, 2006 Mark: When Mamiya also made tripods, they had a tripod head with spring tensioned pins that mated with the holes in the body to prevent camera twisting. Peter Link to comment Share on other sites More sharing options...
jeff_g2 Posted August 12, 2006 Share Posted August 12, 2006 The C series also has these holes. C220-C330 etc. On one of those I had a pin break off and rattle around in the hole. The entire bottom section of the camera was outside the main light case of the camera and came off with just a few small screws. This is not the case on the RB where I believe these holes are integral to the main metal body of the case. I use a gitzo plate on the bottom of mine that does not have the pins and I just tighten it very tight. The Gitzo also has a lock that engages so that the screw is unable to be turned when engaged. Link to comment Share on other sites More sharing options...
brian_valente Posted September 7, 2006 Share Posted September 7, 2006 the 120/220 autowind back also uses these holes to keep it from twisting Cheers Brian Link to comment Share on other sites More sharing options...
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