The outer barrel is grooved to accept Canon's MR-14 ring flash which can be used as the principal light source for close-ups or as on-axis fill lighting for portraits.
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The EF 50mm f/2.5 Compact Macro is a relatively inexpensive macro lens with a minimum focusing distance of 23cm (9 inches) offering a maximum magnification of 0.5x actual size.
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Similar lenses from other manufacturers include the Canon EF 50mm f/1.8 II and Nikon AF Nikkor 50 mm f/1.8D.