Compatible with the Sony ADI / P-TTL system, the Nissin Air Receiver enables photographers to set up and control various flashes in an off-camera set-up at a distance of up to 98 feet. It operates on an ISM band radio transmission of 2.4 GHz and supports a high-speed sync rate of up to 1/8000th of a second. The cold foot at the receiver’s bottom and a 1/4"-20 thread give you the freedom to mount the receiver with little effort. For added flexibility, you can select among eight channels and organize up to three groups. Lastly, the receiver is powered by two 2 AAA-type batteries.
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.
Refers to how wide the flash will spread the light. In an automatic flash zoom mode, the flash will detects the focal length of the lens mounted on your camera body, and adjust the light spread the flash emits to match the angle of view of your lens.