What do a.m. and p.m. stand for?

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 of extension tube
1955-60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for extension tube
  • 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.
British Dictionary definitions for extension tube

extension ring

(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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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