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[OM] Film Sharpness Factors [was] Everyone's Film of Choice

Subject: [OM] Film Sharpness Factors [was] Everyone's Film of Choice
From: "John A. Lind" <jlind@xxxxxxxxxxx>
Date: Tue, 08 May 2001 17:47:35 +0000
At 14:17 5/8/01, John Prosper wrote:
From: "Hans-Joachim Busch" <Busch-Koeln@xxxxxx>

Paul,

try the new FUJI PROVIA 400F (the F makes the difference). It is as sharp as
the SENSIA 100.

It's also the most grainless slide film ever made.

John,
Try shooting some Kodachrome 64 and compare sharpness with Provia 100F. The rms diffuse granularity numbers are only part of it. Emulsion thickness also affects sharpness. Unlike E-6 films, Kodachrome emulsions do not contain the dye couplers; they are added during K-14 processing. This allows the emulsions to be much thinner. The very low rms diffuse granularity (nearly as low as Provia 100F) and much thinner emulsions are why Kodachrome 25 and 64 have reputations for extremely high apparent sharpness when projected and printed. Also one of the reasons Kodachrome 200 gets away with rms diffuse granularity numbers comparable to more modern ISO 400 film emulsions and still holds its own as a moderately fast film.

-- John


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