eric_m4 Posted March 18, 2021 Share Posted March 18, 2021 Hello, The Mamiya C330 F/S have a focus lock feature to prevent bellows from slipping out of focus. The older cameras do not have this feature. Does this mean that older cameras slip out of focus when pointed up or down? They seem like they're built so well that nothing would budge unless you wanted it to. I was thinking of getting one of the older Mamiya TLR models but wanted to know if anyone here has any "focus-slipping" problems without the focus-lock feature. Thanks. Link to comment Share on other sites More sharing options...
Jochen_S Posted March 18, 2021 Share Posted March 18, 2021 "Dunno" I believe I never used the lock. But I am hand holding or shooting horizontally from my tripod. I think I 'd appreciate having the lock when erratic user efforts could happen and spoil amplanned shot. Link to comment Share on other sites More sharing options...
John Crowe Posted March 18, 2021 Share Posted March 18, 2021 I had my C330 for over 15 years and never used the lock. Again I either used it handheld or on a tripod and rarely tilted it very far. As you say, I think it would take a fair bit to make it move. Link to comment Share on other sites More sharing options...
neil_grant Posted March 18, 2021 Share Posted March 18, 2021 the focus lock on the most recent C 330 TLR's does have a use - but perhaps not in the way you have imagined. The lens pairs tend not to 'rack out' under the influence of gravity (even with big lenses attached), but they can do just the opposite! They can 'rack-in' from a highly extended bellows. You need to remember that there is in fact an inner bellows with the C TLR, and both 'inner' and 'outer' bellows have a preferred resting dimension. In practice, when you have two bellows very extended - 'they just want to go in a bit'. 2 Link to comment Share on other sites More sharing options...
eric_m4 Posted March 18, 2021 Author Share Posted March 18, 2021 Hey guys, Thanks for replies. I've never had a 6x6 camera with bellows but I've shot a lot of large format. Neils explanation makes sense, but never gave it much thought because every LF camera I've used always had some type of locking system that was just second nature to use - makes sense. Link to comment Share on other sites More sharing options...
laurencecochrane Posted March 20, 2021 Share Posted March 20, 2021 (edited) Not really needed. I have 2 C33s without it. Focus adjust is relatively tight, built in resistance. My RB67 has it. Never used Edited March 20, 2021 by laurencecochrane Link to comment Share on other sites More sharing options...
conrad_hoffman Posted March 20, 2021 Share Posted March 20, 2021 The friction in the rack and guide can vary. Some will move from bellows pull, some less so. After a rebuild and lube they can move pretty easy. I've rarely needed it because I don't do close-ups with that camera. Link to comment Share on other sites More sharing options...
rodeo_joe1 Posted March 20, 2021 Share Posted March 20, 2021 Hmmm. Vertical copying and extreme close-ups with a TLR? I'd worry far more about parallax than bellows creep. 1 Link to comment Share on other sites More sharing options...
laurencecochrane Posted March 20, 2021 Share Posted March 20, 2021 (edited) When I was a kid my fathers bank copied documents vertical ( document vertical ) with a Mamiya TLR & paramender. Edited March 20, 2021 by laurencecochrane Link to comment Share on other sites More sharing options...
eric_m4 Posted March 20, 2021 Author Share Posted March 20, 2021 I guess you could use any camera to copy documents but I wasn't planning on using it for that. I just thought maybe back in the days when the C330 was in production some of the pros were complaining about "lens/focus creep", and the focus-lock feature was Mamiya's response. I could see how many would like to shoot close-up with this camera just because the bellows feature triggers the macro switch in many shooter's brains. I'd like to try it. I have other setups that I could use to get closer but I am curious. I would think the focus-lock feature would be used when copying documents, assuming it was pointed vertically down and not at documents mounted on the wall. Link to comment Share on other sites More sharing options...
JDMvW Posted March 20, 2021 Share Posted March 20, 2021 There probably was some reason for it being there: excess of caution or actual 'creep'. I would think you would soon know if it is needed or not.;) Link to comment Share on other sites More sharing options...
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