The Nissin Macro Flash MF18 for Nikon i-TTL System incorporates a high level of creativity and professional features and an impressive high power Guide Number of: 16m (100 ISO). The flash head extends in diameter and will fit lenses from 49 to 82mm with mount adaptors. The round flash tube and LED modeling lamps give even lighting. Power ratio can be adjusted down to 1/1024 in the Fine Macro mode. Unique Fine Macro mode: Revolutionary Fine Macro technology stabilizes the precise fine light control from 1/128 to 1/1024 in 1/6 Ev steps fine turning to achieve the accuracy of microscope. While in Manual mode, the power ratio can be adjusted from full power to 1/64 in 1/3 Ev steps Tube flash design: Tube flash design is applied to achieve uniform light effect. Light power ratio control can be adjusted independently according to the light conditions Expansion flash head: The ring head can adapt the lens from 49 to 82mm. Expanding the ring head to eliminate the problem of vignetting and hidden corners during macro photographypWireless TTL with multi-function remote control system: The MF18 can be used as master flash to control slave group A and C with ± 3.0Ev compensation setting. Perfectly assorts with Nikon flashes to create more lighting effects Modeling LED: LED focus lamp with light power ratio control makes it easy to focus on the shooting subject. The brightness reflects flash power ratio setting of left and right, the effect can be previewed Color and Auto Rotate Display: The Color Display will automatically follow camera angle in different position and six icons interface gives user friendly operation and representing different menus - Auto, TTL, Wireless TTL (Master), Fine Macro, Manual and Customer Setting