Kod: Zaznacz cały
There isn't much difference in grain among most general purpose developers, but Halcyon belongs to a different class of developers, formulated specifically for superfine grain.
There's a limit to how fine of grain one can use, beyond which dichroic fog develops. The trick is to locate that threshold and stay as close to it as possible without crossing it. But that's just the fine grain; what really matters is the total image quality package delivered at that threshold. Most superfine grain developers give up significant film speed and sharpness for the privilege of grainless negatives, but that's a strategy doomed to the extremes. A fine grain developer will give finer grain with any film, relative to a GP developer, or an acutance developer. If you develop a 400 speed film in a SFG developer, you can expect 100 speed film results, but if it costs you 2 stops of film speed, what have you gained? The only way to get an advantage is to use the slowest, finest grained film available, and at that point, the grain is already so fine that finer becomes meaningless. But if you can develop 400 speed film exposed at box speed and get 100 speed film results, you have a 2 stop advantage in film speed for equivalent grain.
If the grain/speed relationship was the only advantage offered by Halcyon, I wouldn't bother with it, but the total image quality package Halcyon delivers is better than any developer I've ever used, for my purposes. Halcyon doesn't produce the highest acutance or film speed of any developer I've used, but the resolution, gradation, and fine grain are off the charts, the film speed is normal, and sharpness is excellent. TMY-2 and Acros are my favorite films and both produce stunning results in Halcyon, and negatives that scan like a dream.
Formuła wywoływacza jest dostępna tu:
http://photo.net/black-and-white-photo- ... rum/00Y1wj
Wygląda interesująco. Coś jakby wywoływacz idealny ;)
