Fortepan 400 - Schwarzschild effect : LUSENET : Large format photography : One Thread

Hi, does anybody know anything about schwarzschild and Fortepan 400??

-- Oliver Ruether (, December 28, 2001


My only comment on Fortepan 400 is to rate it at 200. I has alot of grain. If you can get the Fortepan 200 and rate it at 100 then you have a MUCH better film and in T max developer I don't blow out the highlights, The prints are great.

-- ED (, December 28, 2001.

Thanks,I like the grain. I develop the fortepan 400 in emofin (9+9 rotation), so I get nearly 800 speed...

-- Oliver Ruether (, December 29, 2001.

Oliver, Perhaps you would get a better answer if the English-speaking community realized you were asking about the reciprocity failure characteristics of this film. Most don't know the term "Schwarzschild effect". I, unfortunately do not use this film, however, if it is a conventional film, its reciprocity characteristics should be similar to that of other (i.e. Kodak, Ilford) conventional films. I imagine that the info can be had at the Agfa web site or from a technical datat sheet from Agfa. Hope this helps, ;^D)

-- Doremus Scudder (, December 29, 2001.

Thanks Scudder, for your helpful hints. Again: "Is there anybody outside, who knows details about the "reciprocity failure " of Fortepan 400? Im planing to use it at night.

-- Oliver Ruether (, December 29, 2001.

Agfa's web site suggests as a rule of thumb: With exposures of one second and longer, simply double the normally indicated exposure to compensate for their film's reciprocity failure. Given the similar nature of Forte films, the Agfa recommendation is also likely to apply.

-- Robert J. Triffin (RJTRIFFIN@RCN.COM), December 29, 2001.

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