1. It fit neatly over the head of the flash and create an exposure of even density across the entire surface of the film.
2. Withou the diffuser, light from the flash is projected straight at the subject creating harsh shadows behind it, but with the diffuser in place, particularly when angled, the light thrown at the subject is much softer.
We have the following items:
For Canon 380X, For Canon 550X/540X, For Canon 580X,
For Canon 430X, For Canon 420X, For Canon 580EX II
For Nikon SB-800, For Nikon SB-600, For Nikon SB-900