The canon ef 20mm f28 usm lens is a versatile lens that delivers superb wide angle images in any scenario with its wide angle field of view and extended depth of field the ef 20mm f28 is a great choice for photographers on the move shooting landscapes architecture or reportage easy to hold and carry at 405g the 20mm lens is exceptionally portable and offers a maximum f28 aperture to allow flash free photography and sharp shooting in low light conditions the ultra sonic motor usm ensur