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.

data display illumination button

Button that illuminates the display screen so it is easier to read in poor lighting conditions.

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.

measuring button

Control button to measure brightness.

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.