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  1. #1

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    Acros and Rodinal

    I use acros and develop in rodinal at 1:100 for 18 minutes and am very happy with the results for 120 film
    The massive dev chart does not list a time or agitation timing for Acros 35mm in Rodinal 1:100 only 1:50 could I use the same timing I use for 120?
    Also what difference does it make to the final image using a more dilute developer?

    may thanks and happy new year

  2. #2
    Thomas Bertilsson's Avatar
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    I haven't been able to substantiate the difference between 1:100 and 1:50 during normal agitation. You do run the risk of exhausting your developer at 1:100 though and have to make sure to put plenty in there.
    If you decide to use less agitation, say every three minutes, or every five minutes, or even just agitate once or twice during the entire developing cycle, 1:100 or even 1:200 becomes advantageous.
    Jokingly, you will use twice the developer at 1:50... BUT, less of your time. And Rodinal is so cheap to use, I'd just go 1:50 all the time like I did when I got sick of agitating for 18 minutes.

    I would use the same dilution for 35mm as 120, perhaps just a smidgeon less due to the heavier base of 35mm. I don't think it'll matter much.

    Have fun.

    - Thomas
    "Often moments come looking for us". - Robert Frank

    "Make good art!" - Neil Gaiman

    "...the heart and mind are the true lens of the camera". - Yousuf Karsh

  3. #3

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    I've found that extended development in highly dilute developer with intermittent agitation, (2 inversions per minute) lets me build the shadow densities without risking blocked highlights. 'The Film Developing Cookbook' gives an explanation of this which makes eminent sense to me. As a starting point I'd run the Acros 35 the same way as the 120 which has been successful for you.

  4. #4
    Thomas Bertilsson's Avatar
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    You might see some slight increase in shadow density by using dilute developers, but what you're referring to is any compensating developer, such as Rodinal or Pyrocat. Your shadow density is based on exposure mainly, what you alter in development of your negatives is the highlights.

    - Thomas

    Quote Originally Posted by BobNewYork View Post
    I've found that extended development in highly dilute developer with intermittent agitation, (2 inversions per minute) lets me build the shadow densities without risking blocked highlights. 'The Film Developing Cookbook' gives an explanation of this which makes eminent sense to me. As a starting point I'd run the Acros 35 the same way as the 120 which has been successful for you.
    "Often moments come looking for us". - Robert Frank

    "Make good art!" - Neil Gaiman

    "...the heart and mind are the true lens of the camera". - Yousuf Karsh

  5. #5

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    Thomas, you're right of course - film speed, (shadow density) is essentially inherent in the film, not in the developer. In fact I've used Rodinal at 1+150, (20 deg. C, 7 min) for 4x5 Tech Pan. It's just that I find my prints appear, (and it may be just appear) sharper with higher dilutions and longer dev. times - even in the same developer.

  6. #6

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    Thanks for the useful and interesting information. I have tried some 35mm at 1:50 for 11.5 minutes and felt had more grain and was less sharp than I would expect from Acros but I did wonder If I was just expecting too much from 35mm having been used to 120.
    I will try 35mm at 1:100 for 18 minutes at 20 deg C) as I do for 120 and see how that goes.

  7. #7
    Thomas Bertilsson's Avatar
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    I think 35mm is definitely capable of sharp beautiful prints, but you have to be a lot more careful with everything from focusing to developing and printing. It will never be as sharp as medium format, and you shouldn't expect that. What you should expect is a very handy tool to capture moments that were perhaps difficult at best with a medium or large format camera.
    - Thomas
    "Often moments come looking for us". - Robert Frank

    "Make good art!" - Neil Gaiman

    "...the heart and mind are the true lens of the camera". - Yousuf Karsh

  8. #8

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    Fair point Thomas I didn't expect to achieve the same results but was surprised at the degree of difference. I think I may have fallen foul of your point that "you have to be more careful with everything.." I need to get out there and shoot and develop more carefully and then see how it looks.
    Thanks for your help

  9. #9

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    I almost always develop Acros is 1:200 Rodinal semistand for about 1 hour. I almost always happy with the results. They results are very easy to print in the darkroom or scan depending upon what I am doing.

    Gary
    Build a man a fire and he will be warm for hours.
    Set a man on fire and he will be warm for the rest of his life.

    Sic gorgiamus allos subjectatos nunc.

  10. #10

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    Thanks. I have seen several references to semi stand development in these forums before but I must admit I don't understand what it is or what the advantage is. I assume it is development in dilute developer for a long period with little agitation what agitation would you use and what would be the advantage of this technique?
    Richard

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