Many flashes come with wide-angle panels, which allow the flash to cover even wider-angle areas such as 14mm. Many call these diffusers but they are not diffusers, those soften light quality. On the 550EX the wide angle diffuser allows for lenses to 17mm, the 580EX to 14mm, and the SB800 to 14mm. The SB900 wide angle deflector can goes as wide as 8mm and it depends on whether you have an FX or DX sensor camera.
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