Olympus c-755 ultra zoom ユーザーガイド

You set the aperture yourself and the camera automatically varies the shutter 
speed so that the picture is taken with the best exposure.

The camera automatically sets the exposure. The 3 AE modes available on 
this camera are P mode, in which the camera selects both the aperture and 
shutter speed, A mode, in which the user selects the aperture and the 
camera sets the shutter speed, and S mode, in which the user selects the 
shutter speed and the camera sets the aperture.
In M mode, the user selects both the aperture and the shutter speed.

The adjustable lens opening which controls the amount of light that enters the 
camera. The larger the aperture, the shorter the depth of field and the fuzzier 
the background. The smaller the aperture, the greater the depth of field and 
the sharper the background. Aperture is measured in f/stops. Larger aperture 
values indicate smaller apertures, and smaller aperture values indicate larger 
apertures.

This converts light passing through the lens into electrical signals. On this 
camera, light is picked up and converted into RGB signals to build a single 
image.

This is used to measure the distance to the subject. The camera determines 
if the image is focused by the level of contrast in the subject.

This refers to recording images using silver halide (the method for recording 
images in conventional, non-digital photography). This system is in contrast 
to still video and digital photography.

A standard for image files by the Japan Electronics and Information 
Technology Industries Association (JEITA).

This determines the exposure by metering and calculating the light levels in 
the center and other areas of the image separately.