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. It's 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.
Ultra-slim and lightweight design
40mm focal length
1:2.8 maximum aperture
57°30' diagonal angle of view
0.3m / 0.98 ft. closest focusing distance
Main Unit Spec
Focal Length & Maximum Aperture= 40mm, 1:2.8
Lens Construction= 6 elements in 4 groups
Diagonal Angle of View= 57°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