Canon EF 40mm f/2.8 STM Lens (Pancake)

This EF 40mm f/2.8 STM Pancake Lens from Canon is a welcome addition to Canon's line-up of EF lenses--a light, inconspicuous "normal" lens. At a featherweight 4.6 oz, this is the lightest lens (along with the 50mm f/1.8 II lens) in the EF family. It's less than one inch long, so it will never draw unwelcome attention to you when you're shooting in public. A bright f/2.8 maximum aperture allows you to shoot under pretty much any lighting conditions, and the sophisticated lens configuration, including one aspherical element, guarantees high image quality from the center to the edge of the frame. The optimized coatings used in constructing the lens greatly reduce ghosting and flare, and deliver superb color balance.

STM functionality provides quiet, smooth and continuous autofocus during video operation (video continuous autofocus only when used with the Canon EOS Rebel T4i). The circular aperture formed by 7 diaphragm blades combined with the wide aperture can give you beautiful bokeh--the out-of-focus background areas of your images. This 40mm lens will give you a view equivalent to 64mm when used on a camera with an APS-C sensor, and is able to focus as close as 11.81". If you're looking for a "normal", everyday lens, this is a good place to start.

Newly developed STM technology for smooth and quiet continuous AF while shooting video (continuous video autofocus only available when used with Rebel T4i camera).
Lightweight and unobtrusive 4.6 oz lens is less than one inch long
Bright f/2.8 aperture for shooting under all light conditions
High image quality from the center to the periphery thanks to its advanced lens configuration including an aspherical element
Optimized coatings that minimize ghosting and flare while providing exceptional color balance
A circular aperture (7 blades) for beautiful soft-focus backgrounds
Short minimum focusing distance of only 11.81"
Mounted on a camera with an APS-C sensor, this lens offers a view similar to a 64mm lens in 35mm format

Focal Length 40 mm
Comparable APS-C Focal Length: 64 mm
Aperture Maximum: f/2.8
Camera Mount Type Canon EF
Format Compatibility 35mm Film / Full-Frame Digital Sensor
Canon (APS-C)
Angle of View 57.3°
Minimum Focus Distance 11.81" (30.00 cm)
Groups/Elements 4/6
Diaphragm Blades 7
Features
Image Stabilization No
Autofocus Yes
Tripod Collar No
Physical
Filter Thread Front: 52 mm
Dimensions (DxL) Approx. 2.7 x 0.9" (6.86 x 2.29 cm)
Weight 4.6 oz (130 g)