The HA-77 Horizontal Extension Arm / Boom Arm from Sirui is a versatile accessory arm for macro photography, mounting dual tripod heads, and more. It features an arm that can be extended in length from 19.7 to 30.3" with the use of a simple twist-lock joint. Each end of the arm can receive a tripod head by way of a reversible 1/4" -20 to 3/8" -16 mounting stud. One end can also be converted to use the included ballast hook for added counterbalance when extending a heavy camera.
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