barrel

Definition: (1) Optics: metal alloy and/or plastics housing for the optical and other components of a lens. * May consist of several nesting barrels, some carrying cams and slots for focusing or zooming functions as well as circuit boards to control mechatronic components such as iris diaphragms and sensors. (2). Fibre optics: a device for joining two connectors carrying fibre optic bundles.

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