Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 68,678   Posts: 1,482,080   Online: 792
      
Results 1 to 10 of 10
  1. #1
    glbeas's Avatar
    Join Date
    Sep 2002
    Location
    Roswell, Ga. USA
    Shooter
    Multi Format
    Posts
    3,307
    Images
    109

    Unicolor drum info wanted

    I've taken to using an 8x10 Unicolor drum for my 8x10 negs because the Ilford drum I started with that had the nice internal cup for holding the chems until process was started bit one of my negs when the lid popped off unevenly on removal, put a huge gouge in the emulsion as big as the end of my finger.

    What I don't know is what the minimum amount of solution is on these and does the internal ribbing cause problems with uneven agitation and flowmarks. We settled on 6 oz. being a good bet and used that with no problems. Who can tell me whats what on this? Is there a best drum for doing negs on a roller base?
    Gary Beasley

  2. #2
    Monophoto's Avatar
    Join Date
    Aug 2004
    Location
    Saratoga Springs, NY
    Shooter
    Multi Format
    Posts
    1,691
    Images
    44
    The detail that I recall from using a Unicolor drum for processing prints is that one used 2 oz of each solution. Don't know if that's the right amount for negatives - I tried to do 4x5's one time and found that there had to be a better way.

  3. #3
    Chaska's Avatar
    Join Date
    Apr 2003
    Location
    Charlotte, NC
    Shooter
    Multi Format
    Posts
    93
    Images
    1
    I use 250ml of solution for Dev, stop, and fix. Then run 500ml of water with 4/5 changes for the wash. I usually flip side to side about every 3 minutes in development to avoid streaks. I have had success with 4 4x5's at a time and 1 8x10.

  4. #4
    Bob F.'s Avatar
    Join Date
    Oct 2004
    Location
    London
    Shooter
    Multi Format
    Posts
    3,984
    Images
    19
    This article: (http://www.largeformatphotography.info/unicolor/) suggests over 200ml is needed - the writer uses 400ml for safety (bottom of the page).

    Cheers, Bob.

  5. #5
    Mongo's Avatar
    Join Date
    Jan 2004
    Location
    Pittsburgh, PA
    Shooter
    Multi Format
    Posts
    960
    I use 250ml when doing 2 4x5's and anywhere from 400-500ml when doing 1 8x10 or 4 4x5's (depending on my mood more than anything...I've never noticed a difference between the two quantities). I don't bother with switching the drum or shaking it...just put it on the base and let it do what it does.

    No streaking or uneven development of any sort with Rodinal, Perceptol, D-76, or Pyrocat-HD. (The last one has worried me, but I gave it a shot and it worked just fine.)
    Film is cheap. Opportunities are priceless.

  6. #6

    Join Date
    Oct 2004
    Location
    Westport, MA.
    Shooter
    Large Format
    Posts
    1,040
    I use Unicolor drums for developing 4x5 negatives as well.
    300ml to 400ml of solution each time. It works fairly well for me.

    I'd like to try using one of those large Jobo drums on a Unicolor Uniroller.
    I believe a 2583 and possibly a 2551 tank would fit.
    I don't know about the Jobo Expert drums, they do look nice though.
    Pricey..

  7. #7
    Dave Miller's Avatar
    Join Date
    Dec 2003
    Location
    Middle England
    Shooter
    Medium Format
    Posts
    3,894
    Images
    2
    I use 2oz to process four 5x4 negs in an orbital processer. Actually it's 100ml, I think thats the same. The amount of fluid required is dictated by coverage requirments rather than chemical activity.
    Regards Dave.

    An English Eye


  8. #8
    donbga's Avatar
    Join Date
    Nov 2003
    Shooter
    Large Format Pan
    Posts
    2,053
    Quote Originally Posted by Dave Miller
    I use 2oz to process four 5x4 negs in an orbital processer. Actually it's 100ml, I think thats the same. The amount of fluid required is dictated by coverage requirments rather than chemical activity.
    Does anyone know if replacement gaskets are available for the tops?

    Thanks,

    Don Bryant

  9. #9
    glbeas's Avatar
    Join Date
    Sep 2002
    Location
    Roswell, Ga. USA
    Shooter
    Multi Format
    Posts
    3,307
    Images
    109
    Quote Originally Posted by donbga
    Does anyone know if replacement gaskets are available for the tops?

    Thanks,

    Don Bryant
    Yes, I think so. In fact someone was offering a set of them just recently here. I've read ordinary O-rings of the right size will work but looking at mine I'd think it would be hard to get a good seal. I've also read a coat of silicone seal will revive old gaskets.
    Gary Beasley

  10. #10

    Join Date
    Apr 2004
    Shooter
    Multi Format
    Posts
    68
    Images
    6
    HI Don,
    I managed to fabricate agasket from the top of a baby formula container but the plastic tops for oatmeal or protein powder will work too,as long as it's of the right diameter. What I did was cut off the rim and then laid the old gasket on top to cut out the "teeth" that hold it into the lid. The gasket I replaced was deformed and leaked a lot, after I made the replacement It had no leakage.
    hope this helps



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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