great stuff jim,
if you lend me the camera i will break the altitude record for a 12x20. i will even carry it myself!
eddie
Jim,
Awesome as usual. I am curious about how you actually developed the film - did you use tubes or trays ? I was talking with a friend of mine who shoots 8x10, and he was having issues with surge marks....Im assuming that it could possibly be even worse on such a large piece of film.
Hi Steve. 1 at a time in an 18X22 tray. I couldn't get the tubes to work one these. Surge marks no matter what I did including shaking the entire CPP from side to side regularly while it was turning.
Jim,
I am curious why you had such problems with tubes. I develop all of my 12X20 fim in rotary processing, using Beseler 16X20 drums on Beseler and Unicolor motor bases. I pour the developer in the drum, turn on the motor and allow for about fifteen seconds of turning, then I lift it off the base and rotate from side to side for fifteen seconds or so. After this first cycle I lift and roate from side to side for ten seconds every minute for the first half of development time, then every two minutes for the second half. I find that the initital up and down agitation on the horizointal should be done very early in development. With the Beseler and Unicolor motor bases RPM is fairly slow, for sure a lot slower than Jobo.
Sandy King
Sandy, Wish it wasn't so. Indeed, I bought the tank from you. Perhaps I'll try it again but do the first 5 minutes off the Jobo tipping end to end while I rotate.
Gee, the memory is completely gone. What kind of tank did I sell you? Is it a Beseler 16X20" print drum? If so, just curious to know if it has the dividers?
Another thing you might try is a weaker dilution. Say, instead of 2:2:100 try 1:1:100. And did you do a pre-soak with the rotary tests?
Sandy
It's the Jobo 3063 and you can put 2 1220's in it using the ribs to hold them in place. I get tire tracks in 2 places where the ribs are not constant.
I just pre-soak enough to get the goo off the back of the film. About 90 seconds. No dividers in the JOBO if it ever had any. Thanks for trying to help.
Hi Jim
there are many more experienced than I but I use the 3063 drum for my 20 x 24 negs. I was having density line problems as well but they were solved when Clay suggested the slowest Jobo speed coupled with taking the drum OFF completely from the rotation and shaking it vigorisously for 10 seconds or so for every minute and half/ two mintues of development and then back onto the slowest rotation of the drum. The problem disappeared immediately for me.
Monty
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