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tmax 100 with F76+

gmed

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I need some help with correcting my dev time. I shoot tmax 100 4x5 at EI of 50 and develop on a rotary system with F76+ 1:9 dilutionn for 10min 12 sec. basically I reduced the massive dev time by 15% to account for rotary constant agitation. Massive dev also recommended 7 mminutes, but I havent tested it yet.

my films arent contrasty, so I have to use PS to bring contrast back.

So im wondering if I should change my dilution or the dev time. I know dilution of 1:5 or 1:7 will make it more contrasty. Any help would be appreciated.
 

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MattKing

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What temperature are you working at?

I note, with interest, that the manufacturer recommends 7 minutes: http://www.claytonchem.com/pdfs/Darkroom/PBF76PLUSFILMDEVELOPER.pdf

Is there any chance you are dealing with over-exposure? Are you printing optically, or just scanning? The increased contrast view certainly shows an excellent range of tones.
 
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gmed

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at 68-69 F. I shoot at EI 50, Im not sure if I should just keep it at 100.
 

RalphLambrecht

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Increasing dev time in 15% increments will make a significant difference.
 

Alan9940

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FWIW, I have a chart directly from Clayton Chem that suggests: TMax 100, EI 100, 1:14 for 8 mins at 75F for rotary processing. That should get you pretty close, and then you can adjust from there.

Good luck!
 
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gmed

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I should mention something important that I failed to disclose. I used red filter and compensated 3 stops which I think is too much, as a result it came out overexposed, but I also think I underdeveloped it.
 

MattKing

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gmed said:
I should mention something important that I failed to disclose. I used red filter and compensated 3 stops which I think is too much, as a result it came out overexposed, but I also think I underdeveloped it.
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It zounds to me like you over-exposed your film. Then you followed it up with what I think is over-development, and then are trying to evaluate the result through a scanned file.

This is tough .

I would guess that you have dense negatives.

Try exposing your negatives at box speed with the correct filter factor, and then develop them for the manufacturer's recommended time of 7 minutes. Show us a picture of the negatives that result, and it will be easier to help from there.
 

wblynch

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Try printing in the enlarger. You might be pleased since it's easier to print through dense negatives, while scanners struggle.
 
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