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> Mamiya 645 ProTL focusing problem |
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#1
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Mamiya 645 ProTL focusing problem
This is the newest camera in my collection by far, but a couple of weeks ago I shot a roll of film only to discover that every shot was focused in front of where I intended. Now a few months ago I did change the focusing screen for one with 35mm crop marks (it came with an alternative back for 135 film), but I'm sure I have used it successfully since then. Possibly I'd previously used smaller apertures which masked the issue.
Should I expect to adjust the focus after changing the screen? - presumably not. There is apparently a known problem with the plastic mirror stop on this model breaking, but it looks ok. |
#2
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Interchangeable focus screens are intended to be a direct swap for one another without the need for any other adjustment.
The fact that you are now focusing closer then intended indicates you have moved the ground glass away from the nodal point of the lens (and nearer to your eye) There are 2 obvious possibilities :- 1) You have not managed to get the screen to sit down on to its correct mounting points. 2) You have put the new focus screen upside down - the focus screen has a ground glass side - and for example it should sit on the face nearest the mirror but you have inverted it so it sits against the microprism - if you follow me. I hope this helps Martin |
#3
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The screen has an offset tab which prevents putting it in the wrong way up, but I will check that it's seated properly when I get a moment.
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