Paterson tanks - capacity and agitation method?

Discussion in 'Black and White' started by johnny_motown|1, Jan 13, 2001.

  1. Hi everybody! For Christmas, I received a Paterson (Super System 4) tank. It is the universal one that can develop two reels of 135 at the same time. I filled it to the recommended capacity for two reels (580ml or 20oz). It barely covers the two reels when I opened the funnel lid (I'm doing this dry run with water). I used the spin stick and it removed the air bubbles fine. My question is do you all fill it more than 580ml (20oz) to ensure better coverage? The instructions also mention putting on the soft plastic lid and agitating it via inversion. With the amount of air that is in it, would it cause excessive bubbles and be a nightmare to keep the film covered? Would I be expected to use the spin stick after every agitation? Do most of you (that have this tank) invert for agitation or do you do the "slide-rotate" agitation?

    <p>

    Just a few newbie questions. Thanks in advance for your help!
     
  2. I have a similar tank and found that using "spin" agitation gave me
    uneven development. Inversion agitation cured that problem. It
    certainly doesn't hurt to fill the tank to more than the absolute
    minimum level either.
     
  3. Forget that spin stick thing; it pretty much guarantees uneven development.

    <p>

    Use just enough solutions to cover the reels, and invert _vigorously_ two or three times in five seconds every 30 seconds or four or five times in 10 seconds every minute. Don't use more solution than is needed to cover the reels.
     
  4. I used the spin stick for agitation for many years and didn't
    experience uneven developement so I'm not convinced that that's the
    case... however, I changed to inversion after reading so many people
    suggesting it. Call it peer pressure :)<P>
    I mix 300ml of developer for one spiral, which is a little more than
    required, but makes the maths for dilution easy (sometimes). I can't
    remember the last time I did two films at once. I also only ever
    have one spiral in the tank although it's regularly recommended to
    put both in to ensure the bottom one (in the liquid) doesn't move up
    (and out of the liquid) during inversions. My tanks nearly 20 years
    old and the spirals never move on the central column. I do this
    because I may want to use the other spiral to develop a different
    film type straight after the 1st one, so the spiral is bone dry and
    the film loads without a problem.<P>
    Using the same tank, this is what I do...<P>
    Straight after pouring the developer in, I give it a couple of twists
    back and forward with the 'spin stick' (not sure why I persist with
    this) then wack the lid on and give it quite a firm shaking, then rap
    the side of the tank several times. Each minute I give 3 inversions
    and a more gentle rap on the side of the tank. Negs look fine, just
    the subjects I need to work on :)
     
  5. Once the film is wet, there is no problem with air bubbles. Also, if
    you fill the tank full, the liquid does not move around as well as you
    agitate the tank. Actually many people use a tank that is one reel
    larger than they need to put a BIG space in the tank for good mixing.

    <p>

    I fill the tank, give it a couple of sharp raps and then use inversion
    agitation.

    <p>

    Once the film emulsion has soaked up the developer some time spent
    without developer in contact with the emulsion is fine.

    <p>

    I did use spin agitation way back when I got started with an old
    Yankee tank. The one with a thermometer in the spinner. I wonder
    where that thing is?
     
  6. When figuring what volume of liquid to use by pouring water over empty reels, remember that the film will displace enough to raise the level a little.
     
  7. Thank you all for putting to rest my fears of uneven development! I
    can't wait to start souping film!
     
  8. I've been using the reel twirler / spin stick for 20+ years with no
    problems. Four gentle back and fourth twists in a 5 sec. interval. My
    tanks sit in a water bath. Lifting them out to do inversions would be
    messy.
     
  9. Like Tim Brown I have been using this same tank for 20 years. I
    always fill to 600ccs to be safe and never invert. I only use the
    twizzle stick and for 10 secs every minute. I have tested the
    invertion method with C41 chemicals - I use Ilford XP2- and I got
    bubbles adhering to the test film 3 times out of 10. I have
    personally never had an uneven development problem using the twizzle
    stick.
     
  10. Twizzle stick (he he) Now that is Photography humour :)
     
  11. Twizzle stick - as in Champagne to remove the bubbles
     

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