Nissin Macro Flash MF18 incorporates a high level of creativity & professional features & an impressive high power Guide Number of: 16m (100 ISO). The flash head extends in diameter & will fit lenses from 49 to 82mm with lens adapters. The round flash tube & LED modeling lamps give even lighting. Power ratio can be adjusted down to 1/1024 in the Fine Macro mode. The MF18 also provides an extraordinary Wireless TTL function, by adding slave flashes high quality performance macro shooting can be achieved.