Same developement time for 35 mm and 120 mm?

Discussion in 'B&W: Film, Paper, Chemistry' started by OMU, Apr 9, 2009.

  1. OMU

    OMU Member

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    I have been testing my E.I for FP4+, HP5+, Delta 100 and Delta 400 with my Leica and Hasselblad. (Using HC 110 in Jobo)

    FP4+ has an E.I at 80 both with my Leica (35mm) and my Hasselblad (120 mm). I have tested and found development time for N, N+1 and N-1 for the film exposed with the Leica. (35 mm)

    I suppose I don’t have to test the development times for the 120 mm?
    Thanks.
     
  2. Christopher Walrath

    Christopher Walrath Subscriber

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    For TMax films, 135 and 120 have identical developing times. You could consult Ilford publications o even the massive dev(elopment) chart to be sure.
     
    Last edited by a moderator: Apr 9, 2009
  3. rossawilson1

    rossawilson1 Member

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    Just make sure you use more juice to cover the film, but same times.. indeed they are!
     
  4. ic-racer

    ic-racer Member

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    I agree with the others that I have found contrast index to be very similar between film sizes. I have ascribed the small differences may arise from different technique. For example, if you only process a single 120 roll in a tank in which you process two 35mm rolls, the 120 may have a greater CI.
     
  5. OMU

    OMU Member

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    Thanks! As I thought.
    Would it be the same for my 4" x 5"?
     
  6. Christopher Walrath

    Christopher Walrath Subscriber

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    Generally 4x5 films require slightly more development than their smaller format counterparts. The most reliable source for info is still going to be your film manufacturer's literature. After that one's own experiences can personalize it somewhat.
     
  7. ic-racer

    ic-racer Member

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    Maybe PE knows more, but the 4x5 Kodak film is thicker then the rollfilm. So, its not all cut from the same sheets or batches. Also, 4x5 is usually processed with a different method than rollfilm. Having said all that, my 4x5 T-max in an Expert Drum gives me about the same contrast index as T-max rollfilm in the 1500 drums, when using identical development times.
     
  8. OMU

    OMU Member

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    OK, I'll start with finding the development times for 35 mm and 120 mm and then do some testing for my 4" x 5" later. But from what you tell me, il expect times not far from what I’ve got from the smaller formats.
     
  9. srs5694

    srs5694 Member

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    Incidentally (and in an admittedly nit-picky way), the film format you're calling "120 mm" is just "120" (or "120 format"). There's nothing about it that measures 120mm, unless perhaps you measure two 6x6 frames. It's actually 60mm across. The "mm" designation does belong with 35mm film; or it can be referred to as 135 film (but not 135mm).

    Weird and inconsistent, I know -- but hey, this is a field in which 4x5 format is bigger than 6x6 format! :wink:
     
  10. ic-racer

    ic-racer Member

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    ...and 6x6 is way bigger than 8 x 11 !