E is for Exposure – #AtoZChallenge – 2020

E is for Exposure

Exposure is a general sense for how much light that reaches photographic film (or an image sensor, in the case of digital cameras). How much light that reaches the film is affected by:

  • shutter speed
  • aperture size
  • amount of light illuminating the subject

Faster shutter speeds reduce the amount of light hitting the film. Larger apertures result in much more light reaching the film. Low light scenes do not put much light onto the film.

A photographer must balance these three variables with the sensitivity of the film to optimize the amount of light getting into the camera in order to get the ‘perfect’ picture. Many modern cameras (including those on cell phones) automatically adjust each of these.

Published by paleololigo

Scientist (Paleontology, Geochemistry, Geology); Writer (Speculative and Science Fiction, plus technical and non-technical Science); Mom to great boy on the Autism spectrum; possessor of too many hobbies.

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