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  1. #11
    Dean Williams's Avatar
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    Quote Originally Posted by Andy K
    The confusion arises because I read 1+50 or even 1+4 as one part developer plus fifty parts water or one part developer plus four parts water.

    Surely if it was supposed to be one part developer to fortynine parts water it would say so?

    You're exactly right, Andy. There should be no confusion about this. 1+50 is 1 plus 50, simple addition, just like we all learned in grammer shcool.

    Quote Fotohuis:
    "The first difference between 1:100 (1+99) and 1+100 for Rodinal I have to see in 35 years darkroom experience, but indeed in theorie you 're right."

    It may not make any difference at 1+100 if you were to mix 1+99 (or 10+990), but what if it said to mix 1+3? Using the same reasoning as the 1+99 (or 10+990) mixture, you would actually mix your 1+3 mixture at 1+2. That would make quite a difference with most developers.
    [COLOR=Sienna][FONT=Arial]Some days are diamonds. Some days a tree crashes through your roof.[/FONT][/COLOR]

  2. #12
    thefizz's Avatar
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    I am with Andy & Dean on this one but I would have thought that 1:100 is the same as 1+100.

    I use Tmax developer with Kodak's times for a ratio mix of 1:4, which to me is 1 part developer to 4 parts water, i.e. 1+4.

    Am I missing something here?

    Peter

  3. #13
    titrisol's Avatar
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    IMHO Rodinal 1+100 works best with decreased agitation. Generally in 20 minutes I agitate once every 2 minutes at most.

    If you are using a JOBO, it'll agitate too much and negs will look too contrasty. I'd cut the time in 20%.

    Quote Originally Posted by david b
    Okay...so I shot some Pan F+ today at ISO 50 and then developed 1+100 for 20 minutes at 68 degrees and the negs look rather good but maybe a bit dense.

    So I am thinking the time is probably around 17-18 minutes.

    (I developed two 120 rolls in a 1000ml jobo tank. 10ml rodinal plus 990ml water)
    Mama took my APX away.....

  4. #14
    david b's Avatar
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    well...i agitated for the first minute and then once every 5 minutes.

    and as I previously said, I think I have to come down to 17-18 minutes which would be a reduction of 10-15 percent. that should be alright.

    more testing later today.

  5. #15
    titrisol's Avatar
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    OK, that should do fine... I thought you were using a motorized JOBO [duh!]

    Quote Originally Posted by david b
    well...i agitated for the first minute and then once every 5 minutes.

    and as I previously said, I think I have to come down to 17-18 minutes which would be a reduction of 20-30 percent.
    Mama took my APX away.....

  6. #16

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    About dillutions: yes 1+4 100ml+400 ml = 500 ml total volume, even in Holland we can calculate

    In case of the example Rodinal 1+100 or 1+99 the failure is within the measuring tolerance so in practice of no importance any more.

    @ Andy K.: Ilford has been hopeless in the Netherlands, we dropped them, even we know their products are of high quality but the delivery time and delivery conditions are hopeless.

    Robert

  7. #17
    thefizz's Avatar
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    Quote Originally Posted by Fotohuis
    The first difference between 1:100 (1+99) and 1+100 for Rodinal I have to see in 35 years darkroom experience, but indeed in theorie you 're right.
    But there is no difference, 1:100 is 1+100 and not 1+99.

  8. #18

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    1:100 means 100 times dilluted.
    So 1000 ml/100=10ml concentrate in a total volume of 1000 ml

    That means: 10 ml concentrate + 990 ml water = 1000 ml total volume =>
    1+99 BINGO

    I will get a drink from you when i ever come to Ireland.

    best regards,

    Robert

  9. #19

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    Sorry no drink: Send me a Pan F+ from your nice country, I will return you Foma or R3 Rollei. :rolleyes:

  10. #20
    thefizz's Avatar
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    So then that means 1:4 is actually 1+3 which means I have been mixing my Tmax developer too weak.

    Yes if you come to Ireland Robert, the drinks are on me.

    Slán
    Peter

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