TX400 in D-76 (1:1), how much compensation for constant agitation?

[Gadfly_71]

Figures that my first post would be a silly question...

So, I've just got my CPP-2 cleaned up and ready to go, but I've no idea how much development time I should take off. When I used 4X5 in the expert drums in school, I reduced my time by about 20%. Would this be about right for 35mm and 120 rolls as well?

Thanks,
Andrew

 

[bdial]

Here it is from the source, there is a section on rotary tube processing;

http://www.kodak.com/global/en/prof...78/j78.jhtml?id=0.2.20.14.18.14.7.14.14&lc=en

 

[Gadfly_71]

Thanks...

Checked there already though. Kodak gives the same time for intermittent (small tank) and constant (rotary). This doesn't seem correct.

The help is appreciated though.

VR/
Andrew

 

[George Collier]

What I remember is about 25% less development, all else being equal, for continuous agitation, which is similar with some of the sheet film examples in the chart that the link above takes you to.
The old recommendations also allowed for increased oxidation, warming up by hands, and temp changes if the room is different than the soup, which would not affect a drum situation.
I would try a test, go for -25%, and refine later. You can always increase contrast in printing, and I don't think you'll be off far enough to lose anything.

 

[Roger Hicks]

Dear Andrew,

I use about 10% when processing 35mm and rollfilm in a CPE-2, and I process a reasonable amount of film about (20 rolls in the last couple of weeks, 5 more today if I get around to it). Of course you'll have to test it for yourself, but given that it's usually easier to print a slightly 'plucky' negative than to print one that's thin and flat, I'd underestimate (10%) rather than overestimate (25%) on the first run.

Cheers,

Roger

 

[tim_walls]

For what it's worth, Ilford's datasheets always recommend 15% for constant agitation, and that's what I've used with no ill effects.

 

[Gadfly_71]

Thanks All!

Looks like I'll start at 10% and adjust after testing.

Regards,
Andrew