D76 + HP5+ EI 250 Starting Times

brothernature

brothernature

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Hey all, I'm thinking of trying out D76 for HP5+ that I shot at an EI of 250.

I use distilled water, at 20 degrees centigrade, does anyone have a starting time for that combo?

I only have a tank that fits 5 rolls, if I wanted to do a test with only one roll, would that be an accurate test if I used the same amount of chemistry I usually do?
 
brothernature said:
Hey all, I'm thinking of trying out D76 for HP5+ that I shot at an EI of 250.

I use distilled water, at 20 degrees centigrade, does anyone have a starting time for that combo?

I only have a tank that fits 5 rolls, if I wanted to do a test with only one roll, would that be an accurate test if I used the same amount of chemistry I usually do?
Click to expand...

You should use the full amount of chemistry the tank is made for, even if only developing one roll. Leaving a lot of empty space in the tank causes the developer to move a lot more when agitating, which increases grain a lot and increases contrast.

I use D-76 1+1 for 11 minutes at 68 degrees (20C) for HP5 at EI-320. 250 is only 1/3 stop more exposure than 320; I would just use the time I give. Reducing time will reduce the film's speed to 250 but will slightly lower contrast, too.
 
Chriscrawfordphoto said:
You should use the full amount of chemistry the tank is made for, even if only developing one roll. Leaving a lot of empty space in the tank causes the developer to move a lot more when agitating, which increases grain a lot and increases contrast.

I use D-76 1+1 for 11 minutes at 68 degrees (20C) for HP5 at EI-320. 250 is only 1/3 stop more exposure than 320; I would just use the time I give. Reducing time will reduce the film's speed to 250 but will slightly lower contrast, too.
Click to expand...

Yeah, what I meant is will having only one roll in the tank be an accurate test, will the developer not exhaust as fast since there isn't as much surface area of the film to develop as there would be with all 5 rolls?

Low contrast is what I want. :)
 
brothernature said:
Yeah, what I meant is will having only one roll in the tank be an accurate test, will the developer not exhaust as fast since there isn't as much surface area of the film to develop as there would be with all 5 rolls?

Low contrast is what I want. :)
Click to expand...

That's not really an issue. Remember that individual rolls will vary in how much of the developer's strength they use, too. A whole roll of winter (snow covering everything) landscape scenes will use more of the developer's capacity than a whole roll of photos of a black man in a black suit standing in front of a dark colored wall. I've never seen film of the first type come out underdeveloped or film of the second type come out overdeveloped.

The developer is designed to have more capacity than needed to fully develop film as long as you do not exceed the number of rolls the developer manufacturer says the developer can handle. D-76 1+1 is somewhat weaker than many modern developers, so Kodak says to use twice the developer volume needed for each roll of film. Develop one roll in a two roll tank; two rolls in a four roll tank; and don't use one roll tanks at all.
 
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