Hi ic-racer
Thanks for the info about the contrast the lens gives at f4.7 as opposed to f16. I'm glad I asked the question...now I have an idea of where I'm going with this...I may do the first negative tonight and sleep on it before moving on to the second one!
Stop Bath
Compared to a water rinse, a dilute acidic stop bath will stop development very rapidly (15 sec) due to the pH change and rapid tunneling of protons compared, to a water bath where developer diffusion takes minutes (the basis of water bath development).
The acid stop minimizes developer oxidation in fixers with dissolved silver, which prevents soluble silver reduction and the formation of dichroic fog. Likewise, the pH change retards aerial oxidation of the developer and oxidation of fixer in the emulsion by radicals generated from the developer, which degrades fixer complexes to partially oxidized insoluble products which stain films and papers, and eventually cause fading and sulfiding. Also, acid helps to maintain the pH of the fixer in a region where it's stable, and where the hardeners are effective and don't precipitate.
In addition, the use of a stop bath rather than water reduces the osmotic shock and resultant swelling of the emulsion which is seen when emulsions with high solute concentrations are placed into water, and thereby may reduce grain clumping.
HP5 has a very long straight line and over exposing 3 1/2 stops won't hit the shoulder unless the subject was a very long SBR. All you have done is push everything up the slope. You haven't altered the slope angle(contrast).
Reducing dev will maybe pull it back down the slope a stop but it will also reduce the negative CI. i.e. reduce contrast.
Note: negative contrast is the steepness of the slope and not how far up the slope the exposure is placed. You haven't increased contrast by over exposing, you will have just created a more dense negative than normal.
Also, the point of reduced development is to contain a long SBR and not over exposure. Thye are not the same thing.
after reading all answes,I agree;develop normally and adjust contrast with printing with a fitting grade of paper and enjoy the shadow detail!firefli,
As others have said, your extra exposure will likely not hurt, especially if you are printing optically (and you should be, since this is APUG)
I have some negatives that proper proof almost blank white, but print just fine. They were overexposed (a lot) and developed normally.
I second rudeofus' suggestion to use a slower working developer. D-23 is easy to mix up and works really well. Of course, you'd have to establish a normal developing time by running tests first. I've never used Xtol, so no help there.
If you really have four shots to play with and you know one is likely not a "keeper," then start with that one. Develop in normally and print. You may be surprised how great the shadow detail is!
Best,
Doremus
What does SBR stand for?
Hi,
With the arrival of pf130, I contact printed using a different group photo instead of developing the 4 negatives I started the thread with - go figure- the temptation to do that was too great. 25 seconds using an incandescent 60w light bulb with a paper towel underneath to lengthen the exposure time for fomalux 312, 1 part pf130 and two parts water for about 2 minutes 20 seconds, and a homemade stop bath (3 parts water to 2 parts vinegar). I counted the seconds out loud to contact print and develop and need a more reliable measuring stick but it still came out pretty well.
Even though the group photos don't really work with 4x5 prints (everyone is too small), I think portraits will become something I can pursue.
Thanks again for your help
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?