Being designed to match X-Pro1's distinctive styling. One dial lets you choose between two modes: AUTO automatically optimizes flash for both outdoor daylight and dark indoor shots; MANUAL for hands-on control. In addition, the built-in flash diffuser has an easy one-touch operation to soften harsh flash effects.
TTL (Through-The-Lens) refers to a light/exposure meter which is compatible with your camera, and takes light readings through the lens to determine the correct settings when in automatic mode. Often, this meter sends out a pre-flash or infrared sensor in order to detect the amount of available light. This signal may inadvertently trip your unit’s built-in slave tripper, and therefore can not be used with flash units.
Refers to the option for the user to override the internal light meter in the camera to either OVER or UNDER expose based on middle/18% gray. This is especially useful when photographing either extremely white/bright scenes or when in very dark/dimly lit scenarios.