A-ttl mode (advanced-ttl) – Canon 300 TL User Manual

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A-TTL Mode (Advanced-TTL)

Use this mode in

fill-in

flash photography to

correct

the

lighting of the main subject and its background outdoors.

The A-TTL Mode works by first measuring the brightness

of the subject and its background. Next, the distance to

the main subject is measured by the SOOTL’s near-in
frared rays. The appropriate shutter speed and aperture

are then set automatically. Flash output is controlled by

directly measuring the light coming through the lens and

reflected from the film surface.

When using fill-in flash in brighter settings, this advance
feature balances the exposure between the main sub

ject and its background to prevent unnatural effects by

automatically reducing flash output (ref. P.38 Flash Ex
posure Level Control Characteristics).