Jobo 1520, Tri-x and Rodinal

[J. Borger]

Perhaps a stupid question but i am new to this.
I have a Jobo 1520 tank and want to develop 35mm and 120 tri-x film in Rodinal 1+50

The tank = +- 500ml

For developing 1x 120 film i need 485 ml liquid, so i just mix 9,5 ml Rodinal and rest water.

But for for 1x135 film i need only 240ml liquid ----mixing in the right proportions will only get me 5ml Rodinal, where i need minimum 10ml per film
So i have 2 options:

- mixing Rodinal 1 + 25 for 1 35mm film and using 240ml liquid
- just do the same as with the 120 film and mix 485ml with 9,5 ml rodinal (1+ 50)

Is this correct ??? In that case i would just stay with same mixture for 120 and 35mm film (1+50; 485ml liquid)

Any help would be higly apreciated!

 

[venchka]

Search this forum. Find many many people who will tell you that they get perfect results with 5 ml of Rodinal.

Will you be rotating the Jobo tank? I would round up to 500ml minimum for everything. But that's just me. Actually, I have a 2553 tank. Jobo says 640ml for rollfilm. I use 800ml because the math works out easier when diluting Xtol.

 

[pau3]

I don't know with rodinal, but kodak advises, when using d76 at 1+1, to increase
developing times by 10% if, for instance, you happen to develope 2 rolls
in a 2 rolls tank. From what you're saying, some increase in the developing time
seems probable. In this cases, however, the only real information comes from
experience, since there are many factors involved.

Pau

 

[J. Borger]

Wayne, Paul .... thanks for the feedback.
Wayne .... i will invert not rotate the tank.
Think i use the same procedure for 120 and 35 and fill up to 500ml as a start!

 

[venchka]

Make sure you have enough developer to cover your film. Extra won't hurt.

Put your reels in the tank. Cover the reels with water and add some extra. Pour out the water and measure it. Round up to an even number.