Canon ZSD-300D Digital Zoom Servo Demand - for J21, J16, J11, HJ21, HJ18, HJ16, HJ11 and HJ11 Digital Drive ENG/EFP Lenses. The ZSD-300D zoom demand will operate the shuttle shot and frame preset features of the lens. All digital demands connect to the lens via a new one-touch 20-pin connector.

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