Field-test of the Canon EF 28mm f/1.8 USM wide-angle lens. The Canon EF 28mm f/1.8 USM is a large aperture, wide-angle lens that provides impressively natural delineation and beautiful shading. The optical system employs a replicated aspherical lens element suited to the large aperture. This makes the lens compact and minimizes spherical aberration to produce sharp, high image quality. A flare-cut diaphragm installed behind group 1 blocks unwanted light to ensure highest contrast. The closest focusing distance, 0.25m (0.8 ft), is the shortest in its class. Retrofocusing and ring USM provide silent, high-speed AF. Operation is enhanced by the inclusion of full-time manual touch-up focus that can be used in the AF mode and by the non-rotating front lens group. This lens, introduced in Autumn '96, was the second EF wide-angle to feature the ring USM AF motor, after the EF 20mm f/2.8 USM. However, it was the first EF wide-angle lens to feature a maximum aperture larger than f/2.0. Canon EF 28mm f/1.8 USM Lens   Prior to its introduction, the fastest EF wide-angle lens was the EF 35mm f/2.0, which uses the earlier AFD (Arch Form Drive) motor rather than the ring USM version that is slowly replacing all the AFD-type of EF lenses in the Canon EOS System. A non-rotating front lens group enables this EF wide-angle to accept 58mm screw-in accessories such as the ND (Neutral Density) or Circular Polarizer (PL-C) filters without altering the settings during focusing. The 28mm lens also utilizes an internal focusing system that prevents the overall length from extending even when it is focused on its closest minimum distance. This has resulted in a compact lens body that is about the same size as the popular Canon EF 50mm f/1.4 USM standard lens. The 28mm lens when it is focused at infinity The 28mm lens when it is focused at its closest minimum distance << Back to Main . 1 . 2 . 3 . 4 .