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  1. #1
    HocusPocus's Avatar
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    Mamiya 645 Pro - SHUTTER PROBLEM OR [?]

    Dear Apug Members,

    I need your expertise advises; I received present - MAMIYA 645 Pro;
    Last week took some photos, but on short-exposures like 1/1000 1/500 1/250 I Received Shadow;

    Long exposure 1s-1/125s working perfectly!

    Please help me to find solution;

    Here is Long and Short exposure samples.
    Click image for larger version. 

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    Love B/W Negative!

  2. #2
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    When the opening and closing shutter curtains move over the image area, they must move at exactly the same speed, or you'll get the uneven exposure you see. Its an easy adjustment for a technician to make, but not something you can do yourself because it requires a shutter speed tester capable of reading both curtain speeds separately from the overall shutter speed.
    Chris Crawford
    Fine Art Photography of Indiana and other places no one else photographs.

    http://www.chriscrawfordphoto.com

    My Tested Developing Times with the films and developers I use

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    Fort Wayne, Indiana

  3. #3
    HocusPocus's Avatar
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    Quote Originally Posted by chriscrawfordphoto View Post
    When the opening and closing shutter curtains move over the image area, they must move at exactly the same speed, or you'll get the uneven exposure you see. Its an easy adjustment for a technician to make, but not something you can do yourself because it requires a shutter speed tester capable of reading both curtain speeds separately from the overall shutter speed.
    Dear Friend,
    Is there any guide or video to do test shutter curtains myself?


    Regards,
    David
    Love B/W Negative!

  4. #4

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    Not sure if it helps but doesn't the shutter on the Mamiya 645 series shutter run vertically which would mean the shadow would run horizontally if the were a curtain problem.

  5. #5

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    Remove the back and lens, point it at an evenly lit area like a wall and trip the shutter throughout the speed range. On most FP shutters a variance can be seen.

    I agree with mwdake in thinking the shutter runs vertically. Since the area's at the side of the frame and soft edged I'd think more of an obstruction, either in the body of something hanging in front of the lens. Strap, sleeve or similar.
    Heavily sedated for your protection.

  6. #6

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    Hello;
    I would check the seals and flocking. Look at the film back and especially the dark slide. Steven.

  7. #7
    HocusPocus's Avatar
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    snederhiser, John Koehrer, mwdake ,chriscrawfordphoto
    thank you for replay!


    1/500
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    Love B/W Negative!

  8. #8

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    Which way does the shutter run? We're assuming vertical but is that accurate?
    Heavily sedated for your protection.

  9. #9
    HocusPocus's Avatar
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    John Koehrer,
    Mamiya 645 Pro - Curitan - From Left to Right
    Love B/W Negative!

  10. #10

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    Quote Originally Posted by HocusPocus View Post
    John Koehrer,
    Mamiya 645 Pro - Curitan - From Left to Right
    That did not seem correct to me but I am not familiar with the Pro models so I did some looking around.
    I found an online post somewhere else that indicates Mamiya changed the shutter on the 645 series with the Super and Pro models so now it runs horizontally.
    So, with that being the case your problem is almost certainly due to the shutter curtains timings being out of adjustment. A decent camera repairman should be able to fix that for you.

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