Raised dovetail adapter allows use of B91-B flash bracket with Canon 400mm/f2.8-IS lens.
Note about clearance: The FB-A600 raises the clamping surface for the flash arms by 6/10ths of an inch (.600"/15.2mm). There must be, at minimum, 5/8-inch of clearance from the surface of the plate to the barrel of the lens.
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