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  1. #11
    Will S's Avatar
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    I think Les McClean's book (which I think you have right?) has examples of how to calculate N+1, N-1 development etc. I believe it is roughly 20%. So, if you development time is 100 seconds, 83 seconds would be N-1. N+1 would be 120 seconds. N+2 would be 144 seconds.

    But, of course, you have to test, and shorter times on the minus side don't necessarily work if the dev time is too short. 5.5 minutes N-1 would be 5 minutes (4' 58") according to that formula.

    If you can use dilute developer it can be easier to get the results you want since the times are longer.

    I normally expose HP5+ at 200 ISO anyway, so I would suspect that you would be OK at your normal development time as others have said.

    Hope this helps,

    Will
    "I am an anarchist." - HCB
    "I wanna be anarchist." - JR

  2. #12
    Gay Larson's Avatar
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    Quote Originally Posted by Will S View Post
    I think Les McClean's book (which I think you have right?)

    Will
    You are so right, I do have his book and I'll pull it out, thanks.
    Prints available in the APUG GAllery
    www.gaylarsonphotography.com

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