HP5 in D76 1:3 times

[venchka]

Smacks his head hard! Duh! I completely forgot to mention the pre-soak. I do that as well.

[ki6mf]

I use d 76 and HP 5 with a 1:3 dilution for the past several years. I recently changed from 1:3 to 1:2. By 1:2 I mean 1 part developer and 2 parts water. I changed as highlights were not coming our enough and I am using stronger developer to adjust my highlights.

My normal development time, N, is 14 minutes. N- is 2 minutes per stop down to N -3. N-3 would be 8 minutes with agitation once per minute. Beyond N-3 I use D 76 1:5 as compensating developer. Compensating times are 15 minutes with agitation every 2 minutes.

ISO based on my film speed test ISO is 300 for my Pentax V. For my Sekonic 758 the ISO turned out to be 200. I measured the EV on a gray card with my Pentax V then moved the ISO on the Sekonic till I got the same EV. I think you could use ISO 200 and then adjust ISO speed based on some test shots.

This was first tested for my gear at New England School of Photography and it is working fine. This will get you close for D 76 it won't work for other developers. That would require complete film speed and print testing.

I don't presoak as the long development times take care of any streaking.

[ki6mf]

As a follow up I would test prior to jumping in with my formulas and technique to see if they work the way you want. Also I am shooting 4X5 using HP Combi daylight agitation tanks!

[Allen in Montreal]

Scott,

I do not use the same drum as yourself, but I use HP 5 in D-76 at 1:1 for 4x5, 5x7 and 8x10 and have never had streaks, unless I had not properly rinsed the lid between batches. With the Jobo 3006 (and others in the series), I have found flushing out the trap in the lid more critical than rinsing the actual drum. Just a small detail you want to keep your eye on.

I think your drums hold the soup until you flip the drum horizontally?
It takes me 15 seconds to fill the drums as they spin using this high tech tool.
Sorry if it does not apply to your drums, it works very well with the jobo.

HI

I am looking to develop my 8x10 HP5 sheets in D76 diluted 1:3. I am using a unicolor tank and roller and am looking to try to avoid some streaking that I have experienced thus far using the rotary processor. I have theorized that my previous use of DDX at 1:1 results in streaks and splotches on parts of my negative that have uniform tonality (such as sky). This occurs when I pour in the developer, which takes a good 20 seconds. D76 at 1:3 is much more slow acting, and I have read about success with 1:3 in avoiding the problems I have experienced.

Does anyone use d76 at 1:3 with HP5 and have a good normal time to start out with? If you are not using a rotary processor or if you are, just let me know. Thanks a lot!

Scott

[neil poulsen]

Why 1:3?

1:2 is easier to mix, easier to expand development, etc.

Actually, I meant 1:1.