Exposure latitude

Rudolphono · 2010-05-27T12:55:24+00:00

Der Fomapan 400 hat ja einen Belichtungsspielraum von ISO100/21 bis ISO 800/30. Das sind ja nach unten 2 Blenden und nach oben eine Blende. Bedeutet das, d...

Rudolphono

The Fomapan 400 has an exposure latitude ranging from ISO 100/21 to ISO 800/30. That’s two stops downwards and one stop upwards. Does that mean it reacts more sensitively to overexposure than to underexposure? Isn’t it usually the other way round? All in all, that’s only an exposure latitude of 3 stops. Isn’t that rather little for a black-and-white film? Black-and-white film stock can usually be overexposed or pushed to the extreme, can’t it? Regards, Ralle

Otto

The exposure latitude depends largely on the contrast of the subject. If the subject contrast is high, the exposure latitude disappears completely. It can even go so far that a subject with high contrast cannot be fully reproduced on the film. This means that either the highlights or the shadows suffer, or even both. High or low contrast can be compensated for to a certain extent by adjusting the development (e.g. zone system). Ultimately, the subject contrast determines the usable speed of a film. Here’s some more information: http://de.wikipedia.org/wiki/Belichtungsspielraum http://www.elmar-baumann.de/fotografie/fotobuch/node17.html I hope this answer helps a little. Best regards, Otto!