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This 40 mm f/2.8 lens belongs to the Canon family of EF lenses. Being the lightest lens in that family, this lens weighs only 4.6 oz (136.03 g). Its thickness is less than 1 inch (2.54 cm) and is therefore unobtrusive for the effective maneuvering of the camera. The aperture of this Canon lens is f/2.8 that allows photographing under almost any light condition. The evenness of the picture from the center to the edges of the frame and good color balance is guaranteed by the aspherical construction of this 40 mm f/2.8 lens. The focal length of this lens is 40 mm and has an angle of view of 57.3 degrees. The minimum focal distance of this Canon lens is 11.81 inches (30 cm). This Canon EF lens is constructed in six elements in four groups and has seven diaphragm blades. This Canon lens is optimally coated for reducing ghost and flare effects on the images. This Canon EF lens has the capability for quiet and smooth auto focusing enabled by STM technology. The dimensions of this lens are 2.7 inches long by 0.9 inches wide (6.86 cm by 2.29 cm).