extension tube

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

Origin:
1955–60

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
extension ring or extension tube
 
n
photog a spacer element that can be fixed between the camera body and the lens to increase the distance between film and lens and allow closer focus than would be possible without it
 
extension tube or extension tube
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The extension tube can be sewn or tied to this opening end of the trap.
The first robber carried a modified shotgun with an attached telescopic site and magazine extension tube.
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