aperture-an opening, usually circular, that limits the quantity of light that can enter an optical instrument
shutter-a solid or louvered movable cover for a window
exposure-the total amount of light received by a photosensitive surface or an area of such a surface, expressed as the product of the degree of illumination and the period of illumination
depth of field-the distance between the nearest and furthest objects in focus as seen by a camera lens
F-stop-the setting of an adjustable lens aperture, as indicated by an f number.
focal length-the distance from a focal point of a lens or mirror to the corresponding principal plane
obscura-optical device used in drawing
calotype-proccess which records images on paper
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