Search found 50 matches

by Jay DeFehr
Sun Jan 14, 2007 7:14 am
Forum: The Digitaltruth Forum
Topic: Film developers other than Ilford or Kodak
Replies: 24
Views: 22945

GSD-10

Hi Clay. There were many glycin/soda formulae that differed mainly in the ratio of the constituents and the concentrations of the working solutions. The same is true of the many metol developers, pyro developers, etc., etc. The ratios, proportions and concentrations of developers can have a profound...
by Jay DeFehr
Sun Jan 14, 2007 6:50 am
Forum: The Digitaltruth Forum
Topic: 777 Panthermic developer
Replies: 4
Views: 7750

777

Hi Georges, 777 is similar in formulation to Edwal 12, Edwal 20, Germain's and other ultrafine grain developers. This class of developer relies on the properties of p-phenylenediamine in combination with secondary agents like glycin, metol, or catechol, or some combination of the above, and is used ...
by Jay DeFehr
Sun Jan 14, 2007 6:21 am
Forum: The Digitaltruth Forum
Topic: Film & Developer Combinations.
Replies: 16
Views: 15135

Ornello,

since you obviously consider yourself informed, and competent to quantify film/developer characteristics, I wonder if you could describe for us your methodology for testing film speed, grain and sharpness?

Jay
by Jay DeFehr
Tue Dec 19, 2006 8:32 pm
Forum: The Digitaltruth Forum
Topic: Film developers other than Ilford or Kodak
Replies: 24
Views: 22945

GSD-10

Hi Keith.

I'm sorry it took so long to get back to you. You can find details about GSD-10 here:

http://gsd-10.blogspot.com/

Jay
by Jay DeFehr
Thu Dec 07, 2006 4:35 pm
Forum: The Digitaltruth Forum
Topic: Film developers other than Ilford or Kodak
Replies: 24
Views: 22945

GSD-10

GSD-10 sounds an interesting developer. Who makes this product?
You can make it, if you like, or I can make it for you.

Jay
by Jay DeFehr
Wed Dec 06, 2006 6:40 pm
Forum: The Digitaltruth Forum
Topic: Film developers other than Ilford or Kodak
Replies: 24
Views: 22945

F-76

Lowell was kind enough to send me a sample of F-76, and I'm currently using it as a non-staining control developer in testing some staining developers. F-76 is a very good developer, and as a liquid concentrate, very convenient to use one-shot. Given the choice between D-76, and F-76, I'd choose F-7...
by Jay DeFehr
Sun Dec 03, 2006 10:17 pm
Forum: The Digitaltruth Forum
Topic: Large-Format (8x10 inch) Cameras.
Replies: 7
Views: 8980

Hi Keith. For studio portraiture you can use a studio camera, which don't usually bring big money on ebay, or elsewhere, because they're not very practical for field, or even location work, and professional studios are usually more interested in making money than in making big negatives. I think eve...
by Jay DeFehr
Sat Dec 02, 2006 7:24 pm
Forum: The Digitaltruth Forum
Topic: Large-Format (8x10 inch) Cameras.
Replies: 7
Views: 8980

810

Hi Keith. Which camera would suit you best depends on what you want to do with it. If you'll be shooting a lot of architectural stuff, you'll want good WA/short- FL performance, bag bellows, etc., and full, preferrably geared movements front and rear. If you'll be doing mostly portraiture, you'll wa...
by Jay DeFehr
Wed Nov 15, 2006 7:23 pm
Forum: The Digitaltruth Forum
Topic: PYRO developing in a Jobo ATL-1000
Replies: 26
Views: 21731

It's clear enough that you've never used a pyro developer, which doesn't make you much of an authority on the subject, does it? Why don't you stick to subjects with which you have at least a passing familiarity? Developers in general, and pyro developers in particular are way over your head. You sho...
by Jay DeFehr
Wed Nov 15, 2006 2:24 pm
Forum: The Digitaltruth Forum
Topic: PYRO developing in a Jobo ATL-1000
Replies: 26
Views: 21731

Anyone who actually uses a staining developer can test for themselves to see how a stained neg prints on VC papers. I've printed thousands of them, myself. Everything I've written is absolutely true, verified by me, in real working conditions. The only reason I engage in any kind of discourse with t...
by Jay DeFehr
Wed Nov 15, 2006 12:33 am
Forum: The Digitaltruth Forum
Topic: PYRO developing in a Jobo ATL-1000
Replies: 26
Views: 21731

Pyro stain is not invisible to VC paper. Repeat that to yourself until you understand. I don't even know what you mean by: It is 'invisible' when there is a lot of green in the pack. and I suspect that you don't either. Pyro developers have long been prized for their acutance characteristics. The ta...
by Jay DeFehr
Tue Nov 14, 2006 11:06 pm
Forum: The Digitaltruth Forum
Topic: PYRO developing in a Jobo ATL-1000
Replies: 26
Views: 21731

Orny, I am not agreeing with you. You maintain that pyro stain is "invisible" to VC paper, which it most certainly is not. I'll try to keep it very simple for you, pyro stain adds printing density with VC paper. I've written nothing about film speed, which is an entirely different subject, and has l...
by Jay DeFehr
Tue Nov 14, 2006 8:08 pm
Forum: The Digitaltruth Forum
Topic: PYRO developing in a Jobo ATL-1000
Replies: 26
Views: 21731

I think there is a lot of confusion surrounding the effects of stained negs on VC papers, and a lot of it has to do with misconceptions about the way VC paper works. VC paper emulsions are made up three separate blue-sensitive emulsions, with varying sensitivities to green light. All of the layers a...
by Jay DeFehr
Tue Nov 14, 2006 4:32 pm
Forum: The Digitaltruth Forum
Topic: PYRO developing in a Jobo ATL-1000
Replies: 26
Views: 21731

Orny posted more of his typical misinformation while I was typing my response to Keith. He's wrong, of course, and his ignorance of the principles of staining developers obvious. Pyro stain is certainly NOT invisible to VC paper. A pyro stained neg can be bleached in Farmer's Reducer to remove the s...
by Jay DeFehr
Tue Nov 14, 2006 4:18 pm
Forum: The Digitaltruth Forum
Topic: PYRO developing in a Jobo ATL-1000
Replies: 26
Views: 21731

Hi Keith. I've done the kind of comparison you're suggesting, many times over. Unfortunately, there are just too many variables to control, too little resolution on a monitor, and too much subjectivity in the final anlysis to make these comparisons definitive in the way you seem to hope. Some charac...