toni_nikkanen Posted August 22, 2008 Share Posted August 22, 2008 I have a Mamiya 7 that has worked well with the 65mm lens. Recently I bought a 80mm lens and tried it. The frame lines in the viewfinder did not change to reflect the 80mm lens. I read this thread here on photo.net: http://www.photo.net/medium-format-photography-forum/00Iq9Z And then tried moving the little tab in the lens mount using a pen and the frame lines change to 80mm just fine. Thinking the problem must be with the lens, I went back to the shop and tried two other 80mm lenses they had. Even on those lenses the frame lines just won't change. So what else could be the problem? It seems as if the body is working fine as the frame line selection tab works when operated manually and all three lenses can't have the same problem, can they? Link to comment Share on other sites More sharing options...
toni_nikkanen Posted August 23, 2008 Author Share Posted August 23, 2008 Also, I would appreciate if someone could send me a good photo of the backside of a 80mm lens and/or of the Mamiya 7 bayonet so I can try to figure out if something's not as it should be. Link to comment Share on other sites More sharing options...
rod_sainty2 Posted August 28, 2008 Share Posted August 28, 2008 Toni, if you hold the 80mm lens with the white alignment dot located at the 12 o'clock position (and rear element facing away from you), one of the three bayonet mount flanges is located at 9 o'clock. At the top end of that flange there is a machined space about 6mm long in which there is a small metal tab. The tab on the 80mm lens has a face about half that space long (ie, about 3mm long). The tab of the 150mm lens is twice the length of that on the 80mm and fills the entire space. The same space on the 43mm and 50mm lenses contains no tab. Therefore, it seems that this tab engages the small black lever on the corresponding position on the camera body and the amount of lever movement selects the correct frameline within the viewfinder. Perhaps the tab on the 80mm lenses has been broken, so the camera defaults to the 65mm frameline, which is what shows when the 43mm and 50mm lenses are mounted. Link to comment Share on other sites More sharing options...
toni_nikkanen Posted August 28, 2008 Author Share Posted August 28, 2008 I can see the tab on the lens and it seems OK, occupying half of the space as you say. However I figured out something more. If I move the level on the camera body all the way, the 150mm framelines don't get completely activated and the 80mm lines are partially visible. It seems as if something is out of place inside the camera and the lever is not able to move correctly. So it could be because of this, that the lever needs to be moved more than the little tab on the 80mm lens will move it. I've found a repair shop who said they could try and fix this and also calibrate the rangefinder while they're at it, so I'll ship the camera over tomorrow. I won't be needing it for a while as I've got way too many rolls of film exposed with it during the last 3 weeks to deal with :) Link to comment Share on other sites More sharing options...
toni_nikkanen Posted October 20, 2008 Author Share Posted October 20, 2008 ..for what it's worth, I got the camera back in 4 days, completely fixed and calibrated. I don't know what was wrong with it but it's fixed now. Link to comment Share on other sites More sharing options...
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