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  1. #1
    baachitraka's Avatar
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    Where to find EFS?

    It is indeed very interesting read about measuring SBR with incident meter as described in BTZS. But there are few things which are unsettling for me.

    If I choose APX 100 to develop with Rodinal 1+50 and compute SBR as described above, I still need to know EFS and development times. How can I find these unknowns?
    OM-1n: Do I need to own a Leica?
    Rolleicord Va: Humble.
    Holga 120GFN: Amazingly simple yet it produces outstanding negatives to print.

  2. #2
    baachitraka's Avatar
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    I do not have any facility for testing a film, so I wonder are there any charts for

    - SBR vs EFS(Effective Film Speed)

    - SBR vs Development times

    available for APX 100 or any slow speed with any developer.
    OM-1n: Do I need to own a Leica?
    Rolleicord Va: Humble.
    Holga 120GFN: Amazingly simple yet it produces outstanding negatives to print.

  3. #3
    Bill Burk's Avatar
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    Look at the Agfa Datasheets for Gamma-time curves. This information can be used to figure out SBR vs Development times.

    If you develop to the manufacturer's recommended times, you should achieve near the rated speed.



 

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