4Autofocus flash operation in low light
In Commander and Repeating flash operations, if light is too low for normal autofocus operation, the SU-800’s AF-Assist Illuminator comes on, enabling you to perform autofocus flash photography. This is activated by a signal from the camera.
•The AF-Assist Illuminator does not work in close-up flash operation.
•The SU-800’s AF-Assist Illuminator supports CLS-compatible cameras’ Multi-Area Autofocus system.
The effective shooting distance with the AF-Assist Illuminator:
Approx. 1m to 10m (3.3 to 33 ft.) with a 50mm f/1.8 lens or less, depending on the lens in use.
Usable lens focal length:
24mm to 105mm
Activating and canceling the AF-Assist Illuminator
You can set the AF-Assist Illuminator to activate or cancel even when receiving a signal from the camera. Press the [MODE] + [] buttons simultaneously for approx. 2 seconds to toggle between the AF-ILL (activated) and the NO AF-ILL (canceled).
MODE | A B |
NO AF-ILL | SEL |
| READY |
LOC
Notes on using the AF-Assist Illuminator
•If the focus indicator does not appear in the camera’s viewfinder even through the AF-Assist Illuminator is on, focus manually.
•The AF-Assist Illuminator will not light up if the camera’s autofocus is locked or the SU-800’s ready-light does not come on.
•Refer to your camera instruction manual for more information.
