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Thread: Rodinal 1+25, 1+50, 1+100 & 1+200 test on Ilford FP4+

  1. #1
    Henry Valtonen L&Scape's Avatar
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    Rodinal 1+25, 1+50, 1+100 & 1+200 test on Ilford FP4+

    I have long thought about making a more controlled test to see the effects of developer dilution. I normally process my FP4+ in Rodinal 1+50, but here I wanted to see all dilutions from 1:25 to 1:200.

    I exposed 4 sheets of 8x10 on a sunny day with no clouds and no change in light. I metered with Minolta Autometer V and my exposure was 1/15 s f:22. It took max 2 min to expose all four sheets.

    Back in the lab I used Jobo 3005 drum with CPP processor with continuous rotation at 20 degree Celsius. I mixed 500ml of developer for each bath and developed the 8x10 sheets as follows:
    Dilution Devel. time
    1:25 8 min
    1:50 16 min
    1:100 32 min
    1:200 64 min

    After drying I made contact prints of each negative using identical exposure and development. I used Multigrade paper with no filtering. The contact sheets were then scanned with flatbed scanner using Vuescan. As I am no expert with this software, the scans were all quite dull/gray/contrastless and did not resemble the contact prints. I used PS autocontrast which gave looks quite a similar to the original contact prints.

    All four negatives are easy to print on #2 paper or with no filter on Multigrade paper. The 1:25 negative is slightly more dense than the others and has slightly higher contrast, but only marginally. I was surprised that even with 1:200 dilution the negative came out very similar to the others. My personal EI for all four developer dilution combinations is around EI 32, which gives dense enought negatives so that the unexposed negative border reaches maximum black.
    Attached Thumbnails Attached Thumbnails Rodinal 25-sm.jpg   Rodinal 50-sm.jpg   Rodinal 100-sm.jpg   Rodinal 200-sm.jpg  
    Last edited by L&Scape; 28-Jun-2022 at 11:46.
    Henry Valtonen, Helsinki
    -----------------------
    8x10" landscapes

  2. #2
    Tin Can's Avatar
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    Re: Rodinal 1+25, 1+50, 1+100 & 1+200 test on Ilford FP4+

    I think very few use/like Rodinol

    Except me

    I use it for nearly everything and have for at least 9 years

    Thanks for posting!
    Tin Can

  3. #3

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    Re: Rodinal 1+25, 1+50, 1+100 & 1+200 test on Ilford FP4+

    Quote Originally Posted by Tin Can View Post
    ...I think very few use/like Rodinol. Except me...
    Not true...I defended Rodinol staunchly in the Bergger 400 thread. This is a great comparison of dilutions. I may try the same with with 120 so that grain can come into play.
    Michael W. Graves
    Michael's Pub

    If it ain't broke....don't fix it!

  4. #4

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    Re: Rodinal 1+25, 1+50, 1+100 & 1+200 test on Ilford FP4+

    One of my favourite photographers and printers, Mark Citret, has never used anything but Rodinal for his LF film development.

    Quote Originally Posted by Tin Can View Post
    I think very few use/like Rodinol

    Except me

    I use it for nearly everything and have for at least 9 years

    Thanks for posting!

  5. #5

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    Re: Rodinal 1+25, 1+50, 1+100 & 1+200 test on Ilford FP4+

    Nice comparison! I visited this park before .

  6. #6
    Henry Valtonen L&Scape's Avatar
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    Re: Rodinal 1+25, 1+50, 1+100 & 1+200 test on Ilford FP4+

    Quote Originally Posted by diversey View Post
    Nice comparison! I visited this park before .
    My darkroom is next to Jean Sibelius's park, a famous Finnish composer.
    Henry Valtonen, Helsinki
    -----------------------
    8x10" landscapes

  7. #7

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    Re: Rodinal 1+25, 1+50, 1+100 & 1+200 test on Ilford FP4+

    Good for you to have a darkroom nearby this nice park. My son played cello in his school symphony orchestra and they played Sibelius’s Finlandia in one semester. We went to visit this park in 2010 and it is very impressive.

    Quote Originally Posted by L&Scape View Post
    My darkroom is next to Jean Sibelius's park, a famous Finnish composer.

  8. #8

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    Re: Rodinal 1+25, 1+50, 1+100 & 1+200 test on Ilford FP4+

    Now you can do them with Sodium Ascorbate and see if the reported/claimed benefits are real.
    "My forumla for successful printing remains ordinary chemicals, an ordinary enlarger, music, a bottle of scotch - and stubbornness." W. Eugene Smith

  9. #9
    おせわに なります! Andrew O'Neill's Avatar
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    Re: Rodinal 1+25, 1+50, 1+100 & 1+200 test on Ilford FP4+

    I've never been a big fan of Rodinal. Sorry.
    Out of curiosity, what EI did you use, and did you use the same EI for all dilutions?

  10. #10
    Henry Valtonen L&Scape's Avatar
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    Re: Rodinal 1+25, 1+50, 1+100 & 1+200 test on Ilford FP4+

    Quote Originally Posted by Andrew O'Neill View Post
    I've never been a big fan of Rodinal. Sorry.
    Out of curiosity, what EI did you use, and did you use the same EI for all dilutions?
    I exposed at EI32 using Minolta Autometer V. All four sheets were exposed identically to reveal any differences when developer dilution is changed.
    Henry Valtonen, Helsinki
    -----------------------
    8x10" landscapes

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