Newton rings can form between any two surfaces that are not in complete contact with each other. Glass to neg, or neg to paper. You most often hear us whining about the glass ones, because that's what we have the most trouble with, as the paper to negative contact is seldom an issue in a frame, because of the give of the paper, and felt. Glass to negative are two fairly hard surfaces, and more prone to the problem in a frame, even under the spring pressure, especially if there is the least bit of moisture on the glass to push a curve in the neg and paper. Roberts anti glare glass is a solution, but I haven't gone that route yet.
Originally Posted by ic-racer
Since the negative contacts the paper, as long as the light hitting the paper is even, it's all the same to the paper, except, of course, in the case of dirty, or scratched glass, where a point source light creates shadows because of the problem glass. But again, no dodging or burning. Glass is cheap. Many if us print with condensor enlargers. There is debate (of course, it's photography), but many persons will tell you they are sharper, and have better contrast. Those of us who use them, know the condensors have to be clean, and scratch free, just like an enlarger lens, camera lens, negative, glass carrier, or the glass in a contact printing frame.
The best contact prints in the world have been made in various closets and darkened workshops with a contact frame, or just a piece of glass, and a bare light bulb, with no math beyond the exposure. The methods for outstanding contact prints won't be found in calculations. You'll find it it your negative, brought out by your practice, patience, persistence, and experience. But all means, experiment, nothing wrong with that. Thats how we get good, but you'll probably find the old wheel still rolls pretty good.
Last edited by JBrunner; 10-22-2007 at 08:56 PM. Click to view previous post history.