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A very well-built macro lens with excellent sharpness and contrast, it has the advantage over the Canon FD 100mm f4 macro both in its wider maximum aperture and in its ability to reach 1:1 magnification all by itself without requiring any extension tube. The price for this greater optical versatility comes in the form of a much longer travel of the focus ring. Refocusing from infinity to closeup (or vice versa) takes a lot more work than with the FD 100mm macro & when fully extended for 1:1 macro this lens is almost three times as long than at infinity focus (and over an inch longer than the fully extended FD 100mm macro). Build quality is excellent, construction appears to be all-metal except for the plastic diaphragm ring.