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  1. #81
    Marvin's Avatar
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    So if I had the 10 roll kit it would just fill my 16 oz. tank and I would make 5 runs with 2 rolls each and use the same chemicals 5 times. Would this be correct for 10 rolls of 35mm.

  2. #82
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    Yes, I've reused C-41 chemicals for 5 times with no problems in Jobo. Of course, the more you reuse, the higher the chance that the process goes outside the specifications. There are a few things to consider:

    - Developer exhaustion (oxidization when it develops the film). This is counteracted by time compensation, but it can never be 100% exact as it depends at least a bit on films used, scene content (densities) etc.
    - Developer dilution, if you use prewash and don't drain well enough
    - Cross-contaminations. Try to keep things clean, especially the developer.
    - Solutions lost in the process. You lose at least 10-20 mL every time in Jobo, so you must have some extra volume to begin with.
    - Bleach buffering capacity lost due to too much developer carry-in. Try to drain as much developer as possible from the tank when you are going to reuse.
    - Too much bleach carry-over in fixer. You could extend the in-between wash if you are going to reuse.
    - etc.

    These all apply to any C-41 chemistry from any manufacturer. I don't believe Rollei would make a big difference.

    However, I find C-41 quite a robust process and even if you went a bit out of specs, it doesn't usually show up---the results look good. Many commercial labs (not real pro labs) may be more off all the time.

  3. #83
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    For those of you waiting for my test results, I have shot and processed all the rolls and printed them, however, I am repeating all of this to verify my findings before making conclusions. I'll post the short hand results here, but I intend to write a more thorough article about it as well. Right now I am waiting on delivery of a second batch of chemicals to arrive.
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  4. #84

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    Quote Originally Posted by Greg Davis View Post
    For those of you waiting for my test results, ...
    It will be interesting to read.

  5. #85

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    I'm considering buying a Digibase kit; does anybody know what the shelf life is for the chemicals once opened?

  6. #86
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    If you can displace most of the air from the bottles, probably at least a year or more.

    But, the part containing CD-4 may die in even less than 6 months if the bottle is big and cannot be squeezed. This is the case with Fuji Hunt 5 l kit. I have started storing the developer concentrate parts in a fridge, and it seems to extend the shelf life even if I cannot squeeze all the air off. This seems much easier than playing with inert gases.

  7. #87

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    Quote Originally Posted by kiebee View Post
    I'm considering buying a Digibase kit; does anybody know what the shelf life is for the chemicals once opened?
    Probably very long since the bottles of concentrate is not full or even sealed at delivery.

  8. #88
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    Quote Originally Posted by steelneck View Post
    Probably very long since the bottles of concentrate is not full or even sealed at delivery.
    However, they probably had a inert gas injected into the bottle to displace oxygen. Of course, one could also do this after opening the bottles, should help it last longer.
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  9. #89
    pmu
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    Please, enlighten me. I am confused about the shelf life of Rollei digibase DEVELOPER. Maco website states:

    "CAPACITY:
    The color developer, working solution, example 250ml: One can at least process 5 films in a approach of 250ml. This requires a rapid processing (within 6 hours) ahead. .."

    So, working solution last only for few hours and after that it's ruined?

    Maco's developing instructions say that "250ml = 3-5 rolls" and in the instructions there is mentioned only this normal non-rotation method (like B&W). I have to say that I have never seen a tank that can develop 120 roll with 250 ml.

    So, I have to mix 500ml of developer = about 12 rolls and develop everything within few hours if I want to use normal non-rotating method?

    Or is that mentioned developer sorking solution shelf life ("6 hours") BS?

    PS: Sorry, I don't know all the right terms.

    Confusing.

  10. #90

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    I can't help you with your main questions; however....

    Quote Originally Posted by pmu View Post
    I have to say that I have never seen a tank that can develop 120 roll with 250 ml.
    It's still not quite 250 ml, but check out this 120-format developing tank. I've got a couple of these and they use 260 ml of solution (the figure is stamped on the lid, and you can sort of make it out in the auction's photo); however, they can't use inversion agitation, just rotational agitation via a rotating stick. I find this very difficult to get right, so negatives developed this way often have streaks. If you're used to this type of agitation and want to save a little money on chemicals, one of these tanks might be just the thing. I believe that Jobo-style rotary tanks could also do a roll of 120 in a similar amount of solution, but I don't know the exact figures offhand. I've seen posts from people who use Paterson-style tanks in this way (rolling them on a countertop) to save chemicals, but I've never tried that.
    Rod Smith



 

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