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Thread: Kodak D-76 8x10 in Expert drum

  1. #1

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    Kodak D-76 8x10 in Expert drum

    Hi guys,

    so far I have been using d-76 1:1 without any issues for 4x5 in Jobos expert drums. However, now that I have upgraded to 8x10 I was wondering about the developer capacity.
    Kodak states max 4 sheets of 8x10 in 1l full strength developer and 2 sheets at 1:1

    Given that I would like to continue using 1:1, how would you adjust the developing time (%) to account for the developer exhaustions if I want to process 4 and / or 5 sheets in one drum at the same time?

    thanks in advance

    Alex

  2. #2
    Pastafarian supremo Rick A's Avatar
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    Re: Kodak D-76 8x10 in Expert drum

    Developing times should remain the same as with 4x5, only capacity has diminished (not really, it's a square inch equation). One 8x10 has the same square inch area as four 4x5's.
    Rick Allen

    Argentum Aevum

    practicing Pastafarian

  3. #3

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    Re: Kodak D-76 8x10 in Expert drum

    Hi Rick,

    what I meant was, that for 4x5 I dont have to worry for developer exhaustion because I can pour enough solution into the drum. Maybe I have reformulate my question: If I would like to keep 1l solution of 1:1 and develop four and / or five sheets of 8x10, by how much (percentage) should I increase the development time?

  4. #4
    ic-racer's Avatar
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    Re: Kodak D-76 8x10 in Expert drum

    According to your first post, 1 liter of 1:1 will only process two 8x10 negatives. You would not need to change your time at all for each two sheets processed.

  5. #5

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    Re: Kodak D-76 8x10 in Expert drum

    Surely developer exhaustion would be related to the image density?

    If you are trying to calculate number of sheets processed before exhaustion is reached, you are likely to be disappointed by the inconsistent results.

    It might be better to restrict the number of sheets/square inches of emulsion done at the same time to make sure you stay away from exhaustion?

    Mike

  6. #6

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    Re: Kodak D-76 8x10 in Expert drum

    Kodak’s D76 document suggests on p2 that you can use 237ml of D76 1:1 to develop 80 sq in of film if you extend the development time by 10%. I haven’t tried this before so you may want to test this and share your results.

    If you use Developer D-76 diluted 1:1…you can develop one 135-3 roll (80 square inches) in 473 mL (16 ounces) or two rolls together in 946 mL (one quart) of diluted developer. If you process one 135-36 roll in a 237 mL (8-ounce) tank or two
    135-36 rolls in a 473 mL (16-ounce) tank, increase the development time by 10 percent (see the following tables).

    https://imaging.kodakalaris.com/site...ources/j78.pdf

  7. #7

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    Re: Kodak D-76 8x10 in Expert drum

    @IC-racer but I want to process 4 sheets at the same time in 1l at 1:1

  8. #8

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    Re: Kodak D-76 8x10 in Expert drum

    @mpirie: good point about image density. Didnt consider that aspect!

  9. #9

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    Re: Kodak D-76 8x10 in Expert drum

    @howardpan: yep, saw that one. I guess for important work its best to stick to normal development times (full working strength at 4 sheets/l) and try out with less important work with how much you can get away with.

  10. #10

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    Re: Kodak D-76 8x10 in Expert drum

    FWIW, an 8x10 Expert Drum can hold up to 1.5L solution. If running this on one of the Jobo manual processors, you just need to make sure you have a more recent unit with the stronger motor.

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