MeiKe Mk-910 High Speed Sync 1/8000s i-ttl Flash Speedlite Replacement for Nikon Sb910 and Nikon Cameras D800 D800e D600 D7100 D7000 D5200 D5100 D5000 D3200 D3000 D800 D300 D90 Support High speed sync 1/8000s, Front-curtain sync and rear-curtain sync Maximum GN.60 (105mm, ISO 100 meter)/ Flash range 24-105mm lens focal length Advanced wireless lighting, with advanced wireless lighting, wireless multiple flash operation in the TTL (i-TTL)mode can be accomplished with CLS-compatible digital SLRs. In this mode, you can divide the remote flash units into three groups and control the flash output independently for each group, expanding your range of creative multiple-flash shooting techniques. AF-assist illuminator, in autofocus operation, the MK910 emits AF-Assist illumination, which matches the wider AF area of CLS-compatible cameras. With cameras supporting this function, autofocus photography in dim lighting is possible even when the camera's focus point (focus area) is changed. I-TTL mode, monitor pre-flashes are fired at all times. The subject is correctly exposed by the light from the flash lighting and the exposure is less affected by ambient light.