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Tokina Opera AF 16-28MM FX F/2.8 (Canon Mount)Focal length: 16-28mmAperture: f22-f28canon EF mount lensSilent Drive-Module AF motorAFMF clutch Mechanism15 Elements and 13 groups3 Aspherical lenses - 1 large aspherical P-MO element3 All-glass molded Low-Dispersion (SD) elementsWide 1071 - 768 angle of viewgreat for architectural, landscape, and astr..