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spotmeter 
Exposure meter that uses a viewfinder to measure the brightness of precise spots on the scene to be photographed.
eyepiece
Optical disk or system of disks through which the eye sees the image produced by the lens.
data display
Liquid crystal display showing camera readings and calculated exposure data.
shutter speed setting
Buttons that select the length of time a film is to be exposed to light (exposure time).
aperture/exposure value display
Button that displays data (diaphragm opening and exposure time) on suggested exposures based on the brightness of the scene.
memory recall key
Button that displays data stored in memory.
memory key
Button that stores data in memory.
film speed
Button that shows a film’s sensitivity to light as expressed by the ISO or ASA number, where the higher the number, the more sensitive the film.
memory cancel
Button that erases data stored in memory.
objective lens
Optical system formed of lenses attached to a mount that relay light to sensitive cells, which measure the light’s intensity.
lock switch
Device activating or blocking the measuring button.
shadow key
Key that determines the correct exposure when priority is given to the darkest areas in the scene.
highlight key
Key that determines the correct exposure when priority is given to the brightest areas in a scene.
average key
Key that determines the correct exposure based on the average brightness of a scene.
