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EF-S60mm f/2.8 Macro USM The lens employs an inner focusing system in which the first lens group is fixed in position and the second through fourth lens groups move independently in a three-group floating system. This system, also featured in the EF100mm f/2.8 Macro USM lens for 35mm cameras released in March 2000 , combines high image quality at all focusing lengths with a 90 mm working distance in 1:1 macro mode, the longest in its class*
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