Exposure (photography)

Definition and stakes

The Veil Lifted: Modern Developments of Spirit Photography

“ But here is the point: not one of these figures which came out so strongly in the negative was visible in any form or shape to me during the time of exposure in the camera, and I vouch in the strongest manner for the fact that no one whatever had an opportunity of tampering with any plate anterior to its being placed in the dark slide or immediately preceding development. ”
Source: Gutenberg

Portrait of P. H. Emerson P. H. Emerson,  Naturalistic Photography for Students of the Art

“ Another very important point is the fact that the light does not act on the film proportionately to the length of exposure; the greatest action occurs at the earliest part of the exposure, as can be proved, in a rough way, by exposing a plate on different subjects for the same length of time. This fact alone at once and obviously creates a fatal objection to composite photography. It is a fact which must be constantly remembered in relation to tonality. ”
Source: Gutenberg

Charles Rowed,  Collecting as a Pastime

“ By [11] arranging a set of shelves for the groups, and fixing the camera at the most suitable distance I have maintained the same proportion of size throughout, a point which should be borne in mind as one which has saved the necessity of giving more than a few measurements. The times of exposure for the photographs have varied from two minutes to two hours.
Collecting, therefore, has livened up my photography; and it is fresh in my mind that photography has livened me up on two occasions while I have been on this work.
”
Source: Gutenberg

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