The Harbor Digital Design DD-A2 Flash Adapter slips over the flash head for a custom fit, and is the building block for the modular line of flash diffusers available from Harbor Digital Design. It also allows the same diffuser to be used on different flashes.
This adapter will fit the Canon Speedlites 540EX, 550EX & Pentax AF 540 Series flash units, and will accept the Bounce Diffuser (dome) or Ultimate Light Box.
Harbor Digital Design
DD-A2 Flash Adapter