Jobo 2500 minimal chemicals

swchris · Sep 10, 2021

Hi,

today for the first time I've loaded a Jobo 2500 (2523) tank with a 120 film.
Previously I was using 1500 tanks.
On the 1500 tanks there is written the amount of required checmicals. But on the 2500 tank I don't have an indication how much fluid I should put inside.

Can somebody give me a hint for how much chemicals I need to use?

regards,
chris

swchris · Sep 10, 2021

And, yes, I'm using rotation development with an ATL-2

AgX · Sep 10, 2021

270ml

In case you only feed in 1x 120 (thus using only the outer windings):
170ml

AgX · Sep 10, 2021

Keep in mind that the Jobo figures are "physical" volumes: enough to reach all film area, too little to run out of the tank.
You still have to consider the volume from a chemical perspective.

swchris · Sep 10, 2021

AgX said:
Keep in mind that the Jobo figures are "physical" volumes: enough to reach all film area, too little to run out of the tank.
You still have to consider the volume from a chemical perspective.

You mean to have at least 100ml for each film (for the ID-11 I'm using)? Yes, I'm keeping that in mind...

AgX · Sep 10, 2021

If that really is the case you then can use a "too long" tank and put in more fluid volume.
For inversion this then means you just can add stepless any fluid volume as you need, but in rotation you in addition to the volume you like to add might also use homemade displacement inserts to let the added volume become not too big.

At least these are considerations to have in the back of ones mind so to say.

Neal · Sep 11, 2021

Photos of my tanks.

Alan9940 · Sep 11, 2021

Why do you need to use the minimum? I've used 25xx tanks and Expert Drums on my CPP-2 for about 25 years and have always used more than the minimum as stated on the tank. For example, I use 300ml in my 2523 tank since it's a nice round number for easy mixing.

AgX · Sep 11, 2021

Depends on the tank. If you use a series 2500 tank (with cogwheel and open) without a lift, the more you fill the tank to its flow-out limit, the more careful you must be at handling it.

Alan9940 · Sep 11, 2021

AgX said:
Depends on the tank. If you use a series 2500 tank (with cogwheel and open) without a lift, the more you fill the tank to its flow-out limit, the more careful you must be at handling it.

Very true. I do use the lift.

shutterfinger · Sep 11, 2021

I found that I had streaks using 270ml and manual rotation, increasing to 300ml corrected the problem.
JOBO tank/reel instructions:
https://drive.google.com/file/d/17dqaWHD6UIf2zd3mxvbxu_HQ4iHTFX76/view?usp=sharing

Jobo 2500 minimal chemicals

Privacy & Transparency

Privacy & Transparency