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Extension tube image: Extension Tubes by Fg2 (Own work) [Public domain], via Wikimedia Commons.
Bellows attachment image: A bellows for macrophotography mounted in a Canon FT QL by By Alvesgaspar (Own work) [CC-BY-SA-3.0 or GFDL], via Wikimedia Commons.
Close-up filters image: Set of three close-up lenses by Andrew Magill (Flickr) [CC-BY-2.0], via Wikimedia Commons.