extension tube

American  

noun

Photography.

1. any of a series of tubes of varying lengths placed between the lens and a camera body to facilitate closeup focusing.

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Etymology

Origin of extension tube

First recorded in 1955–60

Example Sentences

There are three elements involved in the full-length unit: the base unit with the bin, the extension tube, and the brush bar.

From Forbes

It is exceptionally easy to attach and detach different elements, though, so you can remove the extension tube and attach the brush bar directly to the base unit, or swap out the brush bar for the crevice tool.

From Forbes