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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How to use extension tube in a sentence
Attachments like pet cleaning heads, crevice tools, and extension tubes or hoses add versatility and help the vacuum work on varied surfaces.Stick it to dirt and dust with the best vacuum on the market | Florie Korani | July 28, 2021 | Popular-Science
Each hole has also an extension tube fitted into it, the whole effect being that of seven blowpipes.A Handbook of Laboratory Glass-Blowing | Bernard D. Bolas