Omni-Bounce B f/Viv/Can
OMNI-BOUNCE Type B Fits Vivitar283/285/3700/4600/5600
Also fits Canon 420-430/EZ
These units are a translucent plastic dome which fits directly onto the front of the individual flash units.
No adjustments are required for automatic flash units except to shorten the maximum flash distance for the flash.
These units reduce the maximum distance by a factor of 2.5.