confused about the "active chemicals" for a jobo

[mark_wiens]

After doing some tests and reporting earlier in this forum, I found

that using TMAX RS 1:9 in a Jobo 2583 left me with streaking

problems. When using it at 1:4, I had great results.

 

<p>

 

Now I've been looking into the expert drums (preferrably the

3010) and ran in to the chart about active chemicals needing to

be 50ml per 4 x 5 sheet.

 

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I need to know if I'm understanding this correctly. 10 sheets

need 50ml each of active chemical. (10 x 50 = 500ml) With a 1:9

dilution scheme, I will need 5000ml? That's not right!!

I normally put 1000ml into my jobo which means only 100ml is

active solution. I find it hard to believe that I can only develop 2

sheets when my jobo can hold up to 18 sheets! Hope my

common sense hasn't given out....

[thilo_schmid]

Mark,

 

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take a look at Kodak Document J-86 (can be found on Kodak's Website).

It states that you need 45ml replenishment solution per one roll of

136-36, which is usually stated as 80 square inches of film. That

means four 4x5"sheets or one 8x10" sheet.

 

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Regards,

[bill_jefferson1]

Mark,

 

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I use the Jobo ALT2500, with the expert drums, 4x5, and 8x10, the

drum states 210ml for either one. I have had good results with this.

When doing B&W, have had to alter the program to increase the

clearing agent by an additional 30 seconds.

 

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Bill

[jeffrey_scott]

The total amount of working developer you need is correct at 500ml,

you are confusing active chemical with total amount needed to process

the 10 sheets of film. When you make up your 1:9 dilution that is

your "active chemicals". In other words, for 10 sheets of film in the

Jobo 3010 Expert Drum, mix 50ml of developer with 450ml of water for a

dilution of 1:9. I use a 3010 drum for all my 4x5 processing here at

Labwork-the black & white lab. We also use other Expert Drums for 5x7

and 8x10 film sizes with excellent results. Regardless of how many

sheets I process in the drum however, I always put a liter of

chemistry in to ensure even development; if you put too little in you

may not get consistent results. This is to be sure the film gets

fully submerged in developer as the drum rotates, better to be safe

than sorry as this is not reversible after processing.

[andre_noble4]

Mark: When you dilute your developer that much (1+9), you are right,

you won't be able to process very many sheets at once due to max

volume considerations of your Tank and motor. Your math is on, but be

sure to have your original figure (active volume needed to process

one sheet) down before woking the math.

 

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Additionally, if you are using a CPA-2 or CPP-2 model 1,000 ml final

volume is going to prematurely burn out your Jobo motor, IMHO. Better

to find something in the 400-600ml range - max!, especially if using

the already massive expert film drums.

 

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If you're commited to the Jobo, you may want to change to a developer

you can live with which does not need such high dilution ratios. That

way, you'll be able to process more than just 2 sheets at a time, for

instance.

[thilo_schmid]

I'm not sure about which "dilution" you are talking in the context of

T-MAX <b>RS</b>. The required replenishment solution is independent

of the tank size.<br>

<br>

Regards,

[sal_santamaura]

If you want to follow Anchell & Troop's conservative guideline (250

ml of a developer's basic dilution per 80 square inches of film) you

will need 50 ml of T-Max RS per *four* sheets of 4x5. This means, at

1:9, you'd have to limit the 3010 drum to eight 4x5 sheets with 1,000

ml of dilute developer - - 100 ml concentrate and 900 ml water.

That's maximum motor load for a CPA/CPP-2. On an Autolab, just bump

it up to 1,125 ml and put film in all ten tubes. If you think A&T are

too conservative, try 10 sheets in the 1,000 ml and see how consistent

your results are with varying combinations of exposed images.

[dk_thompson]

TMAX RS has no dilution rate other than using the straight stock

solution (mixed as per directions...mix the whole 1 qt. bottle to half

a gallon of water, add packet of pt. B, top off with water to make 1

gallon). This is the working developer. Mix up a second gallon the

same way. This is your replenisher. You repl. with 45 ml of this to

each 8x10 sheet (4-4x5s, 1-135-36 etc.) in the working soln. The

working soln. lasts 6 mos. in a tightly closed container/ 1 month in a

tank with a floating lid & cover. If you run control strips & figure

out your process, you may get by with more or less replenishment....if

the times are too short (under 5 min.) in your process, you can modify

with 28% acetic acid to lower the pH and slow down the process....

 

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Those are the instructions as per Kodak...know them by heart, because

we've been running it this way for almost 7-8 years now in our tank

line....there are no Kodak instructions for diluting TMAX RS--that

comes from people like John Sexton apparently, which may work okay,

but then you have to chuck out just about everything you'll read from

Kodak. But the stuff was made to run straight & for using in

replenished lines.

[mark_wiens]

I use a uniroller 352 motor base to agitate my jobo 2583. I use

TMX 4 x 5 film. If you go to the info about the film under

kodak.com, you will see developing times for 1:4, 1:7, and 1:9. I

guess now I'm really confused about the differences between

the active, stock, and total, and on which should I base my 50ml

per sheet?

 

<p>

 

Jeffrey, you claim that jobo's recommendation of 50ml of active

chemical is for the whole lot.

 

<p>

 

Sal, A&T says that 250ml per 80 sq in using the developer's

basic dilution. Isn't TMAX RS's basic dilution 1:4?

 

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Andre, I'm glad someone thinks my math is right on, but what is

my active volume needed then? I've considered XTOL, but I wish

I could stick with a liquid concentrate.

 

<p>

 

I would like to jump into using the 3010 drum, but that's another

$300 investment that I might be able to avoid if I figure out what

to do about RS or change to something else.

 

<p>

 

Thanks for all the replies so far too!

[sal_santamaura]

DK: Well, you ought to tell Kodak that T-Max RS is only for use in a

replenished tank line. Take a look at this Kodak page:

 

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http://www.kodak.com/cluster/global/en/professional/support/techPubs/f

32/f32b.shtml

 

<p>

 

to see their "official" recommendations for rotary processing using

T-Max RS at 1:9.

 

<p>

 

Mark: Yes, T-Max RS' basic dilution is 1:4. At that dilution, 250 ml

of working developer includes 50 ml of concentrate. So, regardless of

dilution, per A&T 50 ml of concentrate is required for each 80 square

inches of film. Thus the quantities I mentioned above for 1:9.

[chauncey_l._walden]

John Sexton uses T-Max RS at 1:9 in his Jobo 3006. His development is

extremely consistent. Maybe the 3010 is pushing it.

[dk_thompson]

Sal, I can't get that page to load up...but if that's the old f-32

pamphlet on TMAX Films and TMAX Developer (J-86), I have those in my

hand

right now....TMAX Dev. is not the same as TMAX RS. Here's the link to

Kodak's Professional listing of TMAX Developers:

 

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http://www.kodak.com/global/en/professional/support/techPubs/j86/j86.s

html

 

<p>

 

That's pub. J-86.

 

<p>

 

Am I missing something here if I read this:

 

<p>

 

"T-MAX Developer is available as a one-part concentrate in sizes to

make one gallon and five gallons of working solution. You

can easily mix smaller volumes by mixing one part of the concentrate

with four parts water. T-MAX RS Developer and

Replenisher is available in convenient sizes to make one gallon and

ten gallons of solution; use this solution as a working-tank

solution or a replenisher. The ten-gallon size consists of two

separate units, each to make five gallons of solution."

 

<p>

 

Every little sheet that comes packed into a box of RS says absolutely

nothing--never has--about diluting it. I just pulled one and this is

what it says: "unlike T-Max developer, Kodak T-Max RS Developer and

Replenisher is not intended for mixing smaller volumes. Mix the

_entire_ contents of part A and Part B to prepare a complete developer

and replenishing solution."

 

<p>

 

The basic dilution for TMAX is 1:4, TMAX RS is a different

developer....I can't speak for Kodak, so ask them what the "official"

repsonse is if all the tech sheets say something else.

[dk_thompson]

Sal...ah-ha! Now I see it...leave it to Kodak to bury the crap on

their website....the F-32 I have here is from the 90's...it looks like

the one you found is an addendum labeled Pt.2 from 9-2000....I see the

dilution specs for the RS, but it's confusing as hell when you read

all the fine print, and seems contradictory if you read the tech

sheets for the developer. My apologies....

[bob_moulton]

I use a Expert 3010 and a 2500 series drum on a Uniroller base and

thanks to santa am now using both on a CPA-2. I have followed John

Sexton's suggestions that are included in his workshop handouts. i

use T-Max RS. I mix Part B into Part A and that becomes my stock. I

do not mix the developer into a gallon quantity!

Then I dilute that 1:9. For 12 sheets in the 2500 drum or for 10

sheets in the Expert drum, i use 900ML. That is 90 ML TMax RS and 810

ML water. i process Tmax 100, EI 80, for 10 minutes at 75 degrees. I

used Sexton as a guide and then made tests on my own. That works well.

Bob

[sal_santamaura]

DK: No apology necessary. I used that html "part 2" link only

because I couldn't find the .pdf link on Kodak's site at the moment.

Very strange search results sometimes at kodak.com.

 

<p>

 

The oldest F-32 paper copy I can locate here at the moment is dated

October 1999, and it has the same info as the html file; I remember

high dilution T-Max RS rotary recommendations being included for

quite a few years before that. I suspect it's all traceable back to

Sexton anyway, in his consulting capacity for Kodak.