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Thread: Reciprocity of Fomapan or Arista Ultra

  1. #1

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    Reciprocity of Fomapan or Arista Ultra

    Does anyone have a reciprocity chart for these films, particularly 100? The manufacturer doesn't have one on the sight. From what I have read, the reciprocity is not the same as typical films.
    Thanks,
    Jim

  2. #2
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    Re: Reciprocity of Fomapan or Arista Ultra

    Have a look here, under the heading "Schwarzschild effect": http://foma-cz.cs4.cstech.cz/en/fomapan-100 - that's a starting point at least.

  3. #3

    Re: Reciprocity of Fomapan or Arista Ultra

    I'm pretty sure you will that info on apug
    I do have it written down for the 100 and 200 films but not on my computer

  4. #4

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    Re: Reciprocity of Fomapan or Arista Ultra

    A very, very high LIRF... 3 stops correction for metered 10 seconds....

  5. #5

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    Re: Reciprocity of Fomapan or Arista Ultra

    I forget where I found these corrected times. These were advertised for Arista EDU 200, which I successfully used despite the fact that the film in the 200 box was actually Arista EDU 100. I'm almost impressed by how extreme and inconvenient these are.

    In seconds:

    1 = 3
    2 = 9
    3 = 16
    5 = 33
    8 = 65
    10 = 90
    13 = 131 (2' 11")
    15 = 160 (2' 40")
    20 = 223 (3' 43")
    25 = 326 (5' 26")
    30 = 418 (6' 58")
    40 = 612 (10' 12")
    50 = 814 (13' 34")
    60 = 1018 (17'00")

  6. #6

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    Re: Reciprocity of Fomapan or Arista Ultra

    Quote Originally Posted by devb View Post
    I forget where I found these corrected times. These were advertised for Arista EDU 200, which I successfully used despite the fact that the film in the 200 box was actually Arista EDU 100. I'm almost impressed by how extreme and inconvenient these are.

    In seconds:

    1 = 3
    2 = 9
    3 = 16
    5 = 33
    8 = 65
    10 = 90
    13 = 131 (2' 11")
    15 = 160 (2' 40")
    20 = 223 (3' 43")
    25 = 326 (5' 26")
    30 = 418 (6' 58")
    40 = 612 (10' 12")
    50 = 814 (13' 34")
    60 = 1018 (17'00")
    Thanks. These should be helpful.
    Jim

  7. #7
    Maris Rusis's Avatar
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    Re: Reciprocity of Fomapan or Arista Ultra

    Here's an excerpt from practical testing of Fomapan 200. The actual results do not match the extremely pessimistic numbers from the manufacturer's "guesswork".

    Fomapan 200 reciprocity characteristics are supposed to be easy to test for so I tried. Well it wasn't so straight forward but three 120 rolls later here are some results:

    The exposure level I chase in landscape metering is Zone IV = shade side of tree bark, dark rocks, etc. The question becomes "what exposure time extensions must I give for long exposures so I get the same negative densities for Zone IV as for short exposures?" Answers obtained:
    Measure 1 second on the meter...give 1.5 seconds
    Measure 2 ... give 4
    Measure 3 ... give 7
    Measure 4 ... give 12
    Measure 6 ... give 18
    Measure 8 ... give 28
    Measure 10 ... give 40
    Measure 14 ... give 48


    For photographs of dark scenes I don't apply the full reciprocity correction. I want the final picture to match the scene with empty black shadows, subdued mid-tones, and a few gleaming highlights. Remember also that the shadow parts of the scene will invoke reciprocity failure in the film but the highlights won't. Extending exposure causes a strong increase in contrast but this can be controlled by reduced development. But reduced development can cause a loss of film speed which calls for even more extended exposure; and so on. It is not so simple to make dark scenes look like bright scenes!
    Photography:first utterance. Sir John Herschel, 14 March 1839 at the Royal Society. "...Photography or the application of the Chemical rays of light to the purpose of pictorial representation,..".

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