Characteristics of Different Developers on 400TX
November Darkroom Meeting – Saturday the 21st
Developers have particular characteristics that interact differently with different films. One of our members has tested three developers, D-76, Diafine and Rodinal, on 400TX and will be sharing results with us at our November meeting. He also made prints using both the diffusing and condensing enlargers. The differences between the prints are clear and he will be sharing the prints as well.
There will be also be a tutorial on how to use the Omega D6 which is currently on loan to the club.
Below is some information about the three developers used for this test.
The Developers Used for the Test
“KODAK PROFESSIONAL D-76 Developer provides full emulsion speed and excellent shadow detail with normal contrast, and produces fine grain with a variety of continuous-tone black-and-white films. For greater sharpness, but with a slight increase in graininess, you can use a 1:1 dilution of this developer. It yields a long density range, and its development latitude allows push processing with relatively low fog.”
Quoted from http://www.kodak.com/global/en/professional/support/techPubs/j78/j78.pdf
“Rodinal is not a fine-grain developer, and is best used with film of low and medium sensitivity, with inherently finer grain than high-speed films, or with larger film sizes.”
“Rodinal increases perceived edge sharpness dramatically: in the case of standing development (no agitation for long developing time, an hour or more) the developer is used up more quickly in dark than in light areas, development of light areas next to dark areas (the edges of the image) is reduced, increasing contrast at edges. Very dilute Rodinal (1 part to 100 or more) is often used to maximise this effect.”
“A well-known property of Rodinal is its high acutance, because the Rodinal formula contains no silver solvent. Consequently the metallic silver in film, once developed, is left in its natural state, and does not undergo any “softening” by means of a solvent. It is not uncommon for photographers to add a solvent (such as sodium sulfite) to soften the granularity.”
Quoted from https://en.wikipedia.org/wiki/Rodinal
“Diafine is usable over a wide temperature range with one developing time for all films. Fast, medium and slow films can now be developed simultaneously without adjustment in developing time. All films with the exception of a few extremely slow emulsions are automatically developed to normal contrast. Time and temperature have no practical effect if the minimum recommendations are observed.”
“Diafine film developer is unsurpassed in its ability to produce greatest effective film speed, ultra-fine grain, maximum acutance and highest resolution. It is a characteristic of Diafine film developer to permit the widest latitude of exposure without the necessity of time-temperature compensation.”
Quoted from http://www.freestylephoto.biz/16128-Acufine-Diafine-Powder-Film-Developer-1-Gallon