Developing 120 and 35mm at the same time?

Discussion in 'B&W: Film, Paper, Chemistry' started by Gerry M, Jul 27, 2012.

  1. Gerry M

    Gerry M Member

    Messages:
    926
    Joined:
    Nov 14, 2005
    Location:
    Oregon
    Shooter:
    Multi Format
    Is it OK to develop 35mm & 120 ACROS together? One roll of each. Both shot at ISO 100. Rodinal 1:50?
     
  2. jnanian

    jnanian Advertiser Advertiser

    Messages:
    20,096
    Joined:
    Jun 21, 2003
    Location:
    local
    Shooter:
    Multi Format
    hi gerry m

    you can process any film at the same time,
    as long as you have room in the tank :wink:

    i wouldn't mix color and b/w or anything like that,
    or something that might process at a different time &c
    just because it is a pain to remove a roll with the lights out
    and finish processing 2 rolls in different tanks &c ...
    but 2 rolls of the same emulsion, same developer, same time ...
    don't hesitate ...

    have fun !
    john
     
  3. Gerry M

    Gerry M Member

    Messages:
    926
    Joined:
    Nov 14, 2005
    Location:
    Oregon
    Shooter:
    Multi Format
    Thanks, John. That seemed right, I just wanted some reinforcement.
     
  4. Klainmeister

    Klainmeister Member

    Messages:
    1,492
    Joined:
    Jun 2, 2010
    Location:
    Santa Fe, NM
    Shooter:
    4x5 Format
    I've done it with Acros. No issues thus far!
     
  5. Gerry M

    Gerry M Member

    Messages:
    926
    Joined:
    Nov 14, 2005
    Location:
    Oregon
    Shooter:
    Multi Format
    Good news. Thanks.
     
  6. summicron1

    summicron1 Subscriber

    Messages:
    1,954
    Joined:
    Jul 28, 2010
    Location:
    Ogden, Utah
    Shooter:
    Multi Format
    each developing roll is a discreet chemical action, so as long as the developing time is the same, you can mix film types all you want -- don't even need to be the same asa rating or brand or anything. 10 minutes in D-76 is ten minutes, one roll doesn't know what the other is. If I have two rolls that have developing times within 30 seconds of each other I even do those together and just give one an extra 30 seconds -- what with pouring and refilling and so on, I figure there's plenty of slop in the system and they all seem to come out fine.:smile:
     
  7. DREW WILEY

    DREW WILEY Member

    Messages:
    4,906
    Joined:
    Jul 14, 2011
    Shooter:
    8x10 Format
    There might be subtle nuances in agitation effect that could make a minor difference in final density, but I certainly wouldn't worry about it. It is important not to let bubbles adhere to the emulsion, since ACROS seems more sensitive than most film in this respect. As soon as the dev is poured into the tank, I give it some decent thumps to dislodge any bubbles, and thereafter from time to time.
     
  8. Richard S. (rich815)

    Richard S. (rich815) Subscriber

    Messages:
    4,967
    Joined:
    Jan 14, 2003
    Location:
    San Francisco
    Shooter:
    Multi Format
    I do 120 and 35mm together all the time. Try 11min at 20C for 1:50 as a good starting point.
     
  9. tkamiya

    tkamiya Member

    Messages:
    4,252
    Joined:
    Oct 3, 2009
    Location:
    Central Flor
    Shooter:
    Multi Format
    So... how'd it come out? :wink:
     
  10. Gerry M

    Gerry M Member

    Messages:
    926
    Joined:
    Nov 14, 2005
    Location:
    Oregon
    Shooter:
    Multi Format
    I'm planning ahead, just a bit. I want to shoot a roll in about an hour. Maybe go down to the harbor and shoot some tourists! We have daylight until about 8:30 PM. I have a roll of 35mm ACROS waiting for developer, so thought I would combine it with 120. Hopefully, will do it tonight.
     
  11. Gerry M

    Gerry M Member

    Messages:
    926
    Joined:
    Nov 14, 2005
    Location:
    Oregon
    Shooter:
    Multi Format
    Rich,
    11 min is better than 13?
     
  12. zsas

    zsas Member

    Messages:
    1,961
    Joined:
    May 12, 2011
    Location:
    Chicago, IL
    Shooter:
    35mm RF
    Have a great shoot tonight! Look forward to hearing of your success!
     
  13. Richard S. (rich815)

    Richard S. (rich815) Subscriber

    Messages:
    4,967
    Joined:
    Jan 14, 2003
    Location:
    San Francisco
    Shooter:
    Multi Format
    Depends on what you plan to do with the negs and the contrast of the scenes. I personally pull back a little on my development times as I often scan the negs and find that is better for the results I want. And I often over-expose the film slightly and then cut development time back about 10% in contrasty situations.
     
  14. Leigh B

    Leigh B Member

    Messages:
    1,033
    Joined:
    Jan 17, 2011
    Location:
    Maryland, US
    Shooter:
    Multi Format
    Just make sure you have sufficient developer (concentrate) for the amount of film being processed.

    The instructions for Rodinal say 10ml/roll (1 roll of 35mm/36 or 1 roll of 120 or 1 8x10 sheet),
    so 2 rolls = 20ml * 50 = 1000 ml of liquid. Is your tank that large?

    - Leigh
     
  15. Gerry M

    Gerry M Member

    Messages:
    926
    Joined:
    Nov 14, 2005
    Location:
    Oregon
    Shooter:
    Multi Format
    I was going to use a JOBO 1520 w/1530 ext. I better measure the combined stack. Seems like I did two rolls of 120 with them but it's been too long to remember :blink:.
     
  16. Gerry M

    Gerry M Member

    Messages:
    926
    Joined:
    Nov 14, 2005
    Location:
    Oregon
    Shooter:
    Multi Format
    It worked out very well. Images posted to gallery, one 645 and one 35mm. Thanks to all for your input.
    Gerry
     
  17. zsas

    zsas Member

    Messages:
    1,961
    Joined:
    May 12, 2011
    Location:
    Chicago, IL
    Shooter:
    35mm RF
    They look great! What time/temp/dilution did you end up doing?
     
  18. Gerry M

    Gerry M Member

    Messages:
    926
    Joined:
    Nov 14, 2005
    Location:
    Oregon
    Shooter:
    Multi Format
    Andy,
    Thanks.
    dil= 1:50
    temp= 68'F/20'C
    time= 11.5 min

    Gerry