Long exposure on Ilford FP4 to create this 6×6 negative using a Mamiya C220 TLR camera.

Film suffers from Reciprocity failure. Reciprocity failure is what happens when, at longer exposures (generally shutter speeds of 1 second or more), the law of reciprocity (you guessed it!) fails!

A film’s emulsion is made up of a layer of silver halide chemicals that react when exposed to light. So, whenever a film photographer exposes an image, their shutter is setting in motion a series of real chemical reactions that eventually will give you your negative.

Over the course of a long exposure, the chemicals in the film emulsion lose their potency and become less sensitive to light as a result. The longer the exposure, the less potent the emulsion becomes over time, and, therefore, the more compensation is needed in order to achieve a proper exposure.

#FilmIsNotDead #AnalogPhotography #MediumFormat #FilmPhotography #Darkroom

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