Extension tube

A set of extension tubes with a pen illustrating the lack of internal lenses

An extension tube, sometimes also called a closeup tube or an extension ring, is used with interchangeable lenses to increase magnification. This is most often used in macro photography.[1]

  1. ^ McHugh, Sean. "Macro Extension Tubes & Close-up Lenses". CambridgeInColour.com. Archived from the original on 5 July 2021. Retrieved 31 July 2021.