Manufacturer’s Description

A unique and indispensable addition to Canon's series of EF lenses, the new 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.

The Specs

Optics
Max Focal Length 40 mm
Minimum Angle of View 57.5 degrees
Min Focal Length 40 mm
Min Focus Distance 7.87"
Max Aperture f/ 2.8
Maximum Angle of View 57.5 degrees
Min Aperture 22 1/f
Filter Size Supported 52 mm
Quick Glance
Max Focal Length 40 mm
Lens Type Medium Telephoto
Max Aperture f/ 2.8
Min Aperture 22 1/f
Compatible Camera Mount Canon EF/EF-S
Usage Information
Lens Type Medium Telephoto
Compatible Camera Mount Canon EF/EF-S
Warranty
Warranty Information 1 Year Limited
More Info
URL http://www.usa.canon.com
Physical Specifications
Diameter 2.7 in
Weight 4.59 oz
Length 0.9 in

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