Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 71,901   Posts: 1,584,534   Online: 1027
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 19
  1. #1

    Join Date
    Oct 2006
    Shooter
    Multi Format
    Posts
    534

    reduced contrast developers for continuous agitation?

    Are there any developers that can provide relatively low contrast in a rotary processor?

    Also, how about developers that can to this at a temperature 75 F?

    Thanks.

  2. #2
    Ian Grant's Avatar
    Join Date
    Aug 2004
    Location
    West Midlands, UK, and Turkey
    Shooter
    Multi Format
    Posts
    16,435
    Images
    148
    You could use a developers like ID-3 which is a Metol based Soft working developer, Ilford used to recommend a filmdevelopment time of approx 12 minutes @ 20°C (68°F) or 9 minutes @ 24°C (75°F). Kodak's equivalent developer was D165.

    If you want even lower contrast use POTA. However I'd be inclined to use something like Rodinal diluted 1+100, that's sufficient to reduce the contrast of most regular films.

    Ian

  3. #3

    Join Date
    Sep 2002
    Location
    Willamette Valley, Oregon
    Shooter
    Medium Format
    Posts
    3,684
    Quote Originally Posted by alanrockwood View Post
    Are there any developers that can provide relatively low
    contrast in a rotary processor? Also, how about developers
    that can to this at a temperature 75 F? Thanks.
    What you need is a developer of low energy. If rotary
    with it's constant agitation is your method then high
    dilution is not possible.

    A home brew which would likely work well could be
    compounded using metol plus a little sulfite and
    powered by bicarbonate of soda.

    A usual off the shelf might also work well if
    loaded with one of the chemicals used in
    tropical developers. Dan

  4. #4

    Join Date
    Jun 2003
    Location
    Los Angeles, CA 90061
    Shooter
    35mm
    Posts
    170
    For rotary processors, we recommend our F 76plus Developer @ 1+14 dilution @ 75ºf. To lower the contrast, you can increase the dilution
    (1+19) or lower the temperature to 70º.

  5. #5
    Thomas Bertilsson's Avatar
    Join Date
    Jan 2003
    Location
    Minnesota
    Shooter
    Multi Format
    Posts
    14,560
    Images
    300
    Pyrocat is great for rotary development. You have to adjust your times from tank processing, obviously.

    If you want to try Pyrocat, I have a dry kit from the Photographer's Formulary that I can send you (if you're in the US). I won't use it.

    - Thomas
    Last edited by Thomas Bertilsson; 05-26-2009 at 01:12 PM. Click to view previous post history. Reason: Adding info
    "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

  6. #6
    ic-racer's Avatar
    Join Date
    Feb 2007
    Location
    Midwest USA
    Shooter
    Multi Format
    Posts
    6,387
    I have done a lot of film/developer testing using a rotary processing paradigme and I would agree that dilute (1:100) Rodinal can do this. There, of course, is a trick to getting the film bathed with 10cc of 1:100 Rodinal in a limited tank volume. (http://www.largeformatphotography.in...ad.php?t=23322)

  7. #7

    Join Date
    Jan 2008
    Location
    Long Island, New York
    Shooter
    Medium Format
    Posts
    1,067
    I've successfully used Rodinal 1:150 with Tech Pan 4x5 - admittedly not with rotary processing; but if it works well with Tech Pan it should be fine as a controlled contrast developer with "ordinary" film.

    Bob H
    "Why is there always a better way?"

  8. #8
    Thomas Bertilsson's Avatar
    Join Date
    Jan 2003
    Location
    Minnesota
    Shooter
    Multi Format
    Posts
    14,560
    Images
    300
    ic-racer, can you post some of your attachments here, for us that are not members of that forum? (please)

    I'd like to see your results as I had no luck at all with Rodinal and rotary.
    "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

  9. #9
    ic-racer's Avatar
    Join Date
    Feb 2007
    Location
    Midwest USA
    Shooter
    Multi Format
    Posts
    6,387
    Quote Originally Posted by Thomas Bertilsson View Post
    ic-racer, can you post some of your attachments here, for us that are not members of that forum? (please)

    I'd like to see your results as I had no luck at all with Rodinal and rotary.
    Sorry, I did not realize you have to be a member to see the images.

    Here is the processing setup:
    Here I am measuring out the Rodinal:

    Here is a screenshot of the Rodinal worksheet that does all the calculations for the dilutions and timing:

  10. #10
    ic-racer's Avatar
    Join Date
    Feb 2007
    Location
    Midwest USA
    Shooter
    Multi Format
    Posts
    6,387
    Scan of a projection print on multigrade paper. Film is a very slow 35mm Tech Pan-like film, with conventional developers the film is very contrasty. (this was Jobo rotary processed with 1:100 Rodinal, 10cc per roll with 8 changes of developer).


    Evenness of the Rotary processed dilute Rodinal is very good (per other tests). As a reality check I did do a comparison with some Technidol and the same Tech Pan-like film and, as expected, the rotary-processed negatives were unusable due to extreme unevenness of development.
    Last edited by ic-racer; 05-26-2009 at 08:43 PM. Click to view previous post history.

Page 1 of 2 12 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin