Jobo 2500 minimal chemicals

[swchris]

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]

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

 

[AgX]

270ml

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

 

[AgX]

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]

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]

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]

Photos of my tanks.

 

[Alan9940]

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]

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]

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]

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