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Thread: Problems with film developed with SP-445 tanks

  1. #1

    Question Problems with film developed with SP-445 tanks

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    Hi All,
    I would like to ask you for advice.

    I develop B&W films using SP-445 tanks.
    But like the attached image, the edges are often exceptionally bright.
    Sometimes one edge is bright, and sometimes two edges are bright.

    However, not all films developed with SP-445 tanks will have this problem.
    I wonder why this happens.

    Thank you for reading.

    p.s. I am sorry that my English is poor.

  2. #2

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    Re: Problems with film developed with SP-445 tanks

    Tell us more - Film, Camera, Lenses used, exposure time/fstop. Development technique developer, volume, agitation, etc...

    center brightness usually occurs with wide angle lenses - in some cases one has to use a center filter. More light is transmitted by center than edges of lens on 90mm or wider.

    one Edge lightness - not enough developer or exposure issue. If it was always at top I would say not enough developer. Otherwise may happen in camera with blockage by internal shutter/bellows.
    The mountain waters of North Georgia call out to me, I visit and leave only tripod holes behind. The Appalachian Trail is my treadmill and gym.
    http://www.esearing.com

  3. #3

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    Re: Problems with film developed with SP-445 tanks

    Quote Originally Posted by esearing View Post
    one Edge lightness - not enough developer or exposure issue. If it was always at top I would say not enough developer. Otherwise may happen in camera with blockage by internal shutter/bellows.
    The illustration makes clear that the issue is edge lightness in the positive, not the negative, so excess density along the edge(s). This points towards either a light leak, or overdevelopment.

  4. #4

    Re: Problems with film developed with SP-445 tanks

    Thank you for your comment and advice.

    I shot three of the same scene with the same lens, and each photo was taken with only the aperture and shutter speed changed.
    (Chamonix 045N-2, 58mm ~ 400mm lenses, Ilford/Kodak/Foma films).
    And I developed these three films together with the SP-445 tank, but I got this edge lightness problem in one film.
    This problem also occurs with films taken with other lenses.

    This edge lightness is linear and occurs at the vertical or horizontal edge.
    This edge lightness may be narrow or wide.
    It looks like it was made with Photoshop's gradient tools.
    It does not occur in elliptical shape.

    Usually I shoot the same scene by changing only the aperture or/and shutter speed and developing it together with the SP-445 tank.
    And I have this edge lightness problem in 1 ~ 2 of 3 ~ 4 films developed together.
    (Kodak XTOL Developer (1+1)(475ml), Ilford Ilfostop Stop Bath, Kodak Fixer, Kodak Hypo Clearing Agent, Edwal LFN Low Foam Wetting Agent).
    (Normally I inversion for the first 30 seconds, then inversion for 6 seconds every 30 seconds.)

    Because of this problem, I have taken several photos of the same scene.

  5. #5

    Re: Problems with film developed with SP-445 tanks

    Quote Originally Posted by koraks View Post
    The illustration makes clear that the issue is edge lightness in the positive, not the negative, so excess density along the edge(s). This points towards either a light leak, or overdevelopment.
    Thank you for your explanation.
    I have not much experience in B&W film developing.
    Could you explain this in more detail?
    And is there a way to test this problem?

  6. #6

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    Re: Problems with film developed with SP-445 tanks

    Quote Originally Posted by koraks View Post
    The illustration makes clear that the issue is edge lightness in the positive, not the negative, so excess density along the edge(s). This points towards either a light leak, or overdevelopment.
    The illustration #2 looks like lightness in the negative.

    If it is DARK in the negative I would agree light leak. The chamonix spring back is not very strong so it is easy to lift slightly while reinserting the dark slide which causes a light leak along the edges, usually along the point where you insert the slide.

    I do not think the tank is the issue unless you are using less than 475ml of developer or losing some to leakage while inverting.
    The mountain waters of North Georgia call out to me, I visit and leave only tripod holes behind. The Appalachian Trail is my treadmill and gym.
    http://www.esearing.com

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