157iChoose a flash control mode for the built-in and optional flashunits.Flash Control1 TTL Flash output is adjusted automatically in response to shoot-ing conditions (TTL flash control).2 ManualChoose a flash level between Fulland 1/32 (1/32 of full power). At fullpower, the built-in flash has a guidenumber of about 5/16 (m/ft, ISO100, 20 °C/68 °F; at ISO 160, theguide number is about 6.3/20.7).A Y icon flashes in the displayduring flash photography whenthis option is selected.
