The AP-11 Adapter is designed for Really Right Stuff and Kirk plates that have flash bracket mounting holes (RRS plates have 2 holes, Kirk plates have 1). Adding the AP-11 to RRS or Kirk lens plates allows you to attach Wimberley flash brackets to the top surface of the plate. Your plates must have holes in them to accept RRS or Kirk flash brackets and you must have at least 5/8" clearance between the top of your existing plate and the barrel of your lens.
Length Requirements for Non-Wimberley Plates
Wimberley Flash Brackets will attach to the bottom of other manufacturers' Arca- Swiss style plates, but the plate must be long enough so that part of the plate's dovetail is available when the plate is safely clamped in the quick-release clamp of your tripod head. Your plate should extend at least 1/2" past the centerline of the quick release clamp to ensure that it is safely clamped. You must also have 3/4" of plate exposed beyond the end of the clamp for the flash bracket to grab.
Note: These are the absolute minimum requirements. If you are not comfortable with these dimensions, you may want to switch to a Wimberley double-dovetail plate. Note that attaching the flash bracket to a relatively short plate limits fore-aft adjustment. This is particularly problematic when using a gimbal head, where precise balance is crucial.
Includes a 5 year warranty.