JOBO tank questions

[venchka]

No doubt all of this information is heare somewehre. My search efforts seem to come up empty.

JOBO 3010 Expert Tank in full manual mode:

1. Volume of chemistry required? JOBO says 210ml to 1000ml. That's a lot of variation. Is the chemistry volume related to the number of sheets loaded? Is there a happy middle ground for anything from 1 to 10 sheets?
2. When loading fewer than 10 sheets, is there a pattern I should follow? Say I have 2 sheets, should I fill one tube or place them opposite each other? If I have 5 sheets, should I load one sheet in each tube? Does it really matter?

JOBO 1500-2500 tank, not sure which one as there is no label on the tank. It holds 2 reels in 35mm format, 1 reel in 120 or 1 2509 6 sheet 4x5 reel. EDIT: The top has a red ring that snaps in place. It has the toothed ring at the opening:

1. Again, volume of chemistry? Another thread mentioned 640ml for 1 or 6 rolls of 120 in a 25xx tank. Is that correct?
2. Loading the 2509 reel, should I load sheets opposite each other or fill one side & then the other?

Thank you for time and patience.

[Nick_3536]

JOBO 3010 Expert Tank in full manual mode:

1. Volume of chemistry required? JOBO says 210ml to 1000ml. That's a lot of variation. Is the chemistry volume related to the number of sheets loaded? Is there a happy middle ground for anything from 1 to 10 sheets?


It's related to process and amount of film. First rule make sure you have enough chemistry to process the film. Then make sure it's over the min amount Jobo suggests and less then the max.





JOBO 1500-2500 tank, not sure which one as there is no label on the tank. It holds 2 reels in 35mm format, 1 reel in 120 or 1 2509 6 sheet 4x5 reel. EDIT: The top has a red ring that snaps in place. It has the toothed ring at the opening:

1. Again, volume of chemistry? Another thread mentioned 640ml for 1 or 6 rolls of 120 in a 25xx tank. Is that correct?
2. Loading the 2509 reel, should I load sheets opposite each other or fill one side & then the other?

.

If it takes a 2509 reel it's a 25xx type tank. Two 35mm reels with a red cap make it a 2521. Sounds right :D

Lets check what the 2521 takes.

The google monster spits out this:

http://www.jobo.com/joboint/products/2500tank.html#Technical%20Specifications

The amount you need depends on what you put in it and even how.

I tend to load the 2509 with the loader. So it's just one after the other.

[venchka]

Thank you! I don't know how I missed the information at the JOBO web page. I also have the loader for the 2509 reel. From the JOBO site, 270ml will do anything I might put in the 2521 tank.

[Nick_3536]

Well 270ml is enough to make the tank happy. The question is does your process need more? Check how much your developer needs.

[venchka]

I will do that. Being the belt & braces type that I am, I don't have a problem with doubling the 270ml figure & rounding up to 600ml. That works out nicely with the D-76 1+3 regime I am currently invesigating.

That leaves me with figuring out how much developer to put in the 3010 Expert drum. Would the same 600ml of D-76 1+3 be ok for 10 sheets of 4x5 film?

[venchka]

If you use D-76 Developer diluted 1:1, dilute it just before you use it, and discard it after processing the batch of film. Before using the diluted developer, make certain that there are no air bubbles in the solution. If air is coming out of the solution and forming bubbles, let the solution stand until the bubbles dissipate. Don't reuse or replenish the diluted solution. You can develop one 135-3 roll (80 square inches) in 473 mL (16 ounces) or two rolls together in 946 mL (one quart) of diluted developer. If you process one 135-36 roll in a 237 mL (8-ounce) tank or two 135-36 rolls in a 473 mL (16-ounce) tank, increase the development time by 10 percent (see the following tables).



Hmmmmmmmmmm...first time I've read this. I haven't done a lot of developing & the last time I did was in 1973. Back then I was using the D-76 1:1. I just loaded 120 film in the Patterson tank, one roll at a time as I recall, and followed Kodak's time/temp. chart. Results were fine to my eye.

[Ron Marshall]

Kodak lists D76 capacity as 4 (8x10) equivalent to 16 (4x5) sheets per liter (1000 ml) undiluted (1:0).

That is 62.5 ml per sheet 1:0 or 125 ml per sheet at 1:1.

The most you can do in the Jobo 3010 is six sheets with 750 ml. You might be able to squeeze in an extra sheet, but I always had a bit of spillage when I approached 900 ml.

XTOL is a better solution if you need more sheets: 25 ml is required per 4x5 sheet at 1:0, 50 ml at 1:1, 500 ml for 10 sheets at 1:1, 750 ml for 10 sheets at 1:2.

The above numbers are based on the minimums stated by Kodak. I usually err on the side of caution by using a bit more developer per sheet than they specify.




http://www.kodak.com/global/en/professional/support/techPubs/j78/j78.jhtml?id=0.2.20.14.18.14.7.14.14&lc=en

[SamReeves]

I use the B&W filling numbers on Jobo's data sheet and then add 20% just to be sure enough solution covers the film. That way if your processor is slightly not level, you will be saved the consternation of uneven development. :)

You can load the sheets into any slot you want to. Just make sure it's a minimum of four at a time for the best result.