The Manfrotto 521SB Remote Control Splitter Box allows you to plug in two 521 series remotes to control the camera with both hands. This means you can control zoom with one unit, and focus with the other, operating them with one hand each.
The 521SB is threaded with a 3/8" and 1/4 - 20" socket and supplied with a thumbscrew to mount directly onto the 595B Fig Rig crossbar.
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Manfrotto 521SB Remote Control Splitter Box Review