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  1. #61

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    thank you for your answer, Richard!

  2. #62
    Bill Burk's Avatar
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    Hi qualsound,

    Sorry I didn't see your question until now, fell off the APUG My Posts screen somehow...

    Richard is right, the reason your earlier 4-stops-underexposed tests never reached zero is that you have Base+Fog included in the density you plotted. I prefer to take out Base+Fog from my graphs but do not want to contradict Ralph Lambrecht who prefers to keep these values embedded. It's his spreadsheet so keep it that way, but that's why your curves do not touch zero.

  3. #63

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    nevermind bill! thank you for clarifying...i just wanted to be sure that 0.12 for 5.5 minutes in ID-11 1:1 is kind of a "normal" B+F density for a hp5...
    ..knowing that i can hopefully carry on my film-tests...

  4. #64
    Bill Burk's Avatar
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    You can fix/wash/dry a piece of film to separate Base from Fog. 0.12 is reasonable Base+Fog for any process. You can probably find base density in the specifications or ask Ilford. 35mm often has a gray base to improve antihalation. 120 and sheet film is usually clear, but even "clear" often measures about 0.05 on my densitometer. (That would mean your Fog might be 0.07 which isn't awful).

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