The nissin macro flash mf18 for canon ittl incorporates a high level of creativity 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 four led modelling lamps give even lighting the power ratio can be adjusted down to 11024 in the fine macro mode mf18 also provides an extraordinary wireless ttl function by adding slave flashes high quality per