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A unique and indispensable addition to Canon's series of EF lenses, the EF 40mm f/2.8 STM offers an ultra-slim and lightweight design. Incredibly compact in size, the EF 40mm f/2.8 STM delivers high image quality from the center to the periphery thanks to its advanced lens configuration including an aspherical element, a bright 2.8 aperture, and optimized coatings that minimize ghosting and flare while providing exceptional color balance. The EF 40mm f/2.8 STM's unobtrusive design helps the photographer avoid overwhelming their subjects with a large lens and to remain discreet in sensitive shooting situations with no compromise in performance. Its diminutive design is complemented by features such as a newly developed stepping motor for smooth and quiet continuous AF while capturing video with the Canon EOS Rebel T4i DSLR, a circular aperture (7 blades) for beautiful soft-focus backgrounds, and a short minimum focusing distance of only 0.98 ft./0.30 m. Specifications Focal Length & Maximum Aperture: 40mm, 1:2.8 Lens Construction: 6 elements in 4 groups Diagonal Angle of View: 57 degrees 30' Focus Adjustment: Inner Focusing System Closest Focusing Distance: 0.98 ft./0.3m Filter Size: 52mm Max. Diameter x Length, Weight 2.7 x 0.9 inch, 4.6 oz. / 68.2 x 22.8mm, 130g