Macro: Macro photography is close-up photography. The classical definition is that the image projected on the "film plane".
ISO: Indication of how sensitive a film is to light.
Aperture: A space through which light passes in an optical or photographic instrument, esp. the variable opening by which light enters a camera.
Shutter Speed: the effective length of time a camera's shutter is open. The total exposure is proportional to this exposure time, or duration of light reaching the film or image sensor.
Triptych: A picture or relief carving on three panels, typically hinged together vertically and used as an altarpiece.
Metadata: A set of data that describes and gives information about other data.
DPI: Dots per inch, a measure of the resolution of printers, scanners, etc.
PPI: Pixels per inch, a measure of the resolution of display screens, scanners, and printers.
Depth: Is the distance in front of and beyond the subject that appears to be in focus.
Exposure: The total amount of light allowed to fall on the photographic medium.
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