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extension ring

British

noun

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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

It features a removable clear lid so you can see how your meal is coming along, a reversible steamer plate with built-in burger formers and extension ring for high-capacity cooking.

From Salon

Like last year, LDSD's doughnut-shaped extension ring inflated as expected, adding surface area to increase the amount of friction and slow the vehicle's descent through the atmosphere.

From Reuters

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023