[rollei_list] Re: developing 120 film - streaks, etc;
- From: Jeff Kelley <thocker@xxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Thu, 4 Oct 2007 16:29:17 -0700
Jim, thanks for the details!
Jeff
> Date: Thu, 4 Oct 2007 14:49:06 -0700> To: rollei_list@xxxxxxxxxxxxx> From:
> jim@xxxxxxxxx> Subject: [rollei_list] Re: developing 120 film - streaks,
> etc;> > Over, back (hitting hard in your palm to dislodge bubbles), twist, >
> over, back (hitting hard in your palm), twist, set the tank down and > don't
> disturb it. On the next cycle, the twists are in the opposite > direction.
> The twist is always after the tank is 'back' sitting > upright (vertical) in
> your palm.> > Pour in developer, do over/back/hit/twist four times before
> setting > down tank. Do again thirty seconds later. From then on, at the next
> > scheduled agitation (1, 2, 3, 4, 5 min or whatever) two >
> over/back/hit/twist, set tank down, undisturbed, until the next > scheduled
> agitation comes up.> > I have a hose in my sink, running with water at the
> correct > temperature (70 deg F for my B&W) and when the tank is sitting >
> between agitation cycles, I let the water run over the tank to keep >
> everything at the proper temperature. The water is running slow so as > not
> to cause the tank to move.> > One important note, DO NOT have any more than a
> few millimeters > between the top of the top reel and the top of the tank.
> The vertical > sliding of the reels can cause uneven development. Sprocket
> hole > marks on 35mm film for sure.> > I always use reels that fill the
> tank(s), filling with empty reels if > necessary - 6cm, 35mm, and Minox -
> whatever necessary to take up the > slack. And I fill the tank completely
> with developer. The vertical > sloshing of developer and/or the sliding of
> reels will definitely > cause uneven development.> > The over and back part
> of the agitation moves things just a little > bit vertically, the twist moves
> things horizontally. With judicious > and careful filling of tanks, and
> agitation procedures, all parts of > the film get washed in new developer but
> no part gets over washed, or > under washed.> > You could use a paint shaker
> and probably get no streaks since the > developer is always moving in all
> directions. Oxidation might be a > problem however. Likewise JOBOs, agitate
> continuously rapidly > longitudinally, in both directions, thus avoiding eddy
> currents > around reel parts.> > I'm sure that there are many many alternate
> scenarios. But this > works, and has worked for me, for many decades.> > :-)>
> > Jim> > > At 02:09 PM 10/4/2007 -0700, Jeff Kelley wrote:> > >OK Jim, what's
> the magical mystery agitation method learned in > >1952? Or is that a secret?
> ;>)> >> >Jeff> >> > ---> Rollei List> > - Post to rollei_list@xxxxxxxxxxxxx>
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