Do you prewash/presoak? How quickly do you fill chemicals?
I'm one of them.
The Jobo worked great for sheet film. But under certain conditions rotation isn't ideal. I could never figure out exactly why it didn't work for 35mm and 120.
Do you prewash/presoak? How quickly do you fill chemicals?
The Jobo worked great for sheet film
I use a Beseler Rotary agitator with Paterson tanks.
Here is a photo with another alternative - it shows a way to use steel reel tanks, as long as you don't mind the clatter.
Here is an internet pic of the agitator:
It is slightly smaller than the light source on logan2z's enlarger
Funny, my experience is the opposite. Jobo works fine for 135, 120 is a mixed bag, but 4x5 in a 2500 tank never worked for me.
I guess we all just have to figure out what works best on an individual basis!
I'll keep my eye out for one. It looks like I want an 8922 since it has the bi-directional feature.
In the meantime, I'm going to switch back to inversion for the next roll and see how things turn out. I switched to rotary processing because I was trying to track down a streaking problem, but I now believe that's related to drying/Photoflo and not a function of the way I was performing inversion agitation at all. We'll see...
Use your roller for the first 30 seconds of continuous agitation, then switch to inversion. That is what I've ended up with, and I'm happy with the results. Then you can use the roller for all the other stages.
In my experience, the non-reversing rotary base works just as well as the reversing one. I tested both pretty thoroughly a long time ago..
I think you mentioned that in another thread of mine before but I can't recall why you use continuous rotary agitation for the first 30 seconds rather than continuous inversion agitation for the first 30 seconds - and then just inversion for the stop/fix stages. In other words, what's the point of rotary at the beginning and what sort of different results were you getting when doing inversion at the start of development instead?
I assumed bi-directional agitation would be preferable since that's what the Jobo processors do.
I can try a unidirectional motor base and see how that goes. I've pretty much tried every other combination of development techniques, so what's one more?
Every 30 seconds or so pick up the tank and turn it 180 degrees and put it back down.
Voila, a reversing agitator.
Yes, on the surface that's a reasonable assumption but has anybody ever managed to find out what benefits Jobo found by reversing the direction, assuming there were benefits. Does the film benefit from this change of direction? Each frame is passing through the developer at a high rate and clearly turbulence of some kind is set up but when I think about it I cannot imagine that a change of direction changes anything if the film then passes through the same developer the opposite way. I suppose that a rapid change of direction may create more turbulence for a second or so and if the change is of a rapid enough frequency it churns the developer more. However is turbulence the key to rotary processing?I assumed bi-directional agitation would be preferable since that's what the Jobo processors do.
Something like this might do the trick
I could do that, I just don't understand the advantage of rotary processing for everything other than the development stage - other than, possibly, a bit of convenience. But the stop/fix stages aren't that long and don't require many manual inversions if doing inversion agitation, so I don't think I really see a big benefit.If you use Jobo tanks you can pre-wet on a motor base, develop with inversion, stop and fix on the motor base. At least that worked for me.
I could do that, I just don't understand the advantage of rotary processing for everything other than the development stage - other than, possibly, a bit of convenience. But the stop/fix stages aren't that long and don't require many manual inversions if doing inversion agitation, so I don't think I really see a big benefit.
Lower volume of chemicals.
And my developer and stop bath beakers get rinsed and start drying while the film is in the first rotating fixer bath - I use two, and do a clip test every time.
The HCA and Photoflo solutions get set up during the second rotating fixer bath.
The rinse between fixer and HCA gets agitated by the roller agitator while other things get dealt with - cleaning and drying thermometers as an example.
The fixer beaker gets rinsed and starts drying while the film is in the HCA.
The HCA beaker gets rinsed and starts drying while the film is washing.
And the tank and the reels and the rotary agitator get cleaned and/or rinsed while the film is in the Photoflo.
And everything up to the wash stage gets consistent, dependable agitation.
PhotoFlo should be done out of the tank/drum and off reel to avoid gumming up the reel with PhotoFlo.
Guess you missed the fact that the film was in the Photoflo while I was cleaning and rinsing the tank and reels.
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