MCO900 TTL Flash -Function same as Nikon SB-900. -GN 58M. -i-TTL mode. -Manual mode. -Illumination mode. -Wireless flash mode. -Master/Romote mode. -Repeating flash mode. -S1/S2 mode. -Menu selection. The MCO900 is a high-performance CLS-compatible speedlight with a large guide number of 58(ISO100 180/M)(111.5/157.5 ft.)(at the 35mm zoom position in Nikon FX format with standard illumination pattern) •Combined with CLS-compatible camera, the MCO900 can easily perform various types of flash operations, such as I-TTL auto flash and wireless multiple flash. •Three types of illumination patterns(standard, center-weighted and even) are available to match different shooting preferences. •Power zoom function automatically adjusts the zoom position to match the lens focal length from 18mm to 180mm. When the built-in wide-flash adapter is used or the diffusion dome is attached, the zoom position is automatically set to match a wide angle lens with much shorter focal length. •Bounce flash or close-up flash photography can be easily performed •Custom functions are provided to allow for various settings. MAIN FEATURES -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. -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 MCO900 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.