Reviews and Problems with Canon Extension Tube EF 25 II
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Canon EF 25mm Extension Tube II
The Digital Picture
29 October 2007
Excerpt: The Canon EF 25mm Extension Tube II is used to allow a lens to focus closer than it does natively. This is accomplished by moving the lens 25mm farther away from the camera body's sensor/film plane by fitting between the camera body and the lens.