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Jan Virtanen
27-Feb-2005, 11:01
Hello,
I just made my first 13x18cm negs, now i need to develope, I have jobo expert drum 3006 tank.
I shot some fp4+ and i am wondering if anyone had any starting times for it in Xtol and
rotary development (I use CPA2).
I have used 1+1 or 1+2 dilution when i develope some 35mm film, and i guess i would need to use
1+2 in sheet film also, cause i make only few shots at a time, and the minimun in the jobo i think is like
400-500ml of total solution.
How much does one 13x18/5x7" sheet need Xtol stock solution to fully develope?
I have also some hp5+ to shoot and wondering about the those times too.

Bill Jefferson
27-Feb-2005, 11:22
Jan
the 3006 expert drum holds the 5x7, 8x10, and 13x18cm uses 270 ml per run
the 3005 i believe is the 4x5 drum, and holds 240 ml. of solution per run

Gary Samson
27-Feb-2005, 11:47
Jan,
You need 100 ml of Xtol stock solution for each 80 square inches of film processed as per Kodak's reccommendation.
It is impossible to suggest a developing time without knowing what you are going to use the negatives for: (platinum, gelatin silver, Azo etc.)

Ted Harris
27-Feb-2005, 12:07
With due respect, I think Bill has it backwards and the 3006 is for 5x7 and 4x5 and the the 3005 for 5x7 and 8x10. You will find the complete specifications, including chemistry needs, herehttp://www.jobo-usa.com/products/3000.htm

Jan Virtanen
27-Feb-2005, 13:22
The negs would be contact printed on regular paper like Kodak fine art fb,
and maybe scanned.

Bill Jefferson
28-Feb-2005, 02:51
Ted,
Sorry no, I use the 3006 at home, whoops i use the 3010 also, my mistake

Jan Virtanen
28-Feb-2005, 07:05
I tried 9mins for fp4+ xtol 1+2, expert drum, eyeballing the neg, looks like maybe 11mins
would do it, it was a low contrast lightning.
I counted the rpms of my CPA2 and looks like its faster than it should be, F agitation was
about 50rpm, when counting the rotation from the printed text on the expert drum.
I read that about agitation= 3 should be 50rpm.
The detail is quite amazing on the neg. Maybe this all hassle might be worth it :)
This is completely the opposite of way of working i have done before, i shoot street photographs.

Bruce Watson
28-Feb-2005, 07:11
The times you are looking for, apparently aren't well known. In other words, I think you'll have to determine them through experiment.

It turns out that rotary development (constant agitation) reduces development time compared to, say, tray developement. This reduction can be from 0% to 30% or more, depending on the film, developer, temperature, and rotation speed.

There's a little article here that explains this a bit maybe:

http://unblinkingeye.com/Articles/Rotary/rotary.html

I suspect that you are just going to have to run the normal zone system experiements to determine your correct EI, and your correct normal development time, for your process.