LAKE SUCCESS, N.Y., August 9, 1995
Canon has expanded its current line of EF lenses with the introduction of the EF 28mm f/1.8 wide angle lens. The optical design incorporates a replica aspherical lens to improve image quality and compactness and offers the shortest minimum focusing distance of any lens in its class.
To block unwanted light, one lens group has a flare-cutting diaphragm matching the image size and because the front lens group is fixed, further adjustment of a circular polarizing filter after focusing is not necessary.
Designed as a premier lens in the most popular wide angle fixed focal length category, the EF 28mm f/1.8 USM's fast aperture enables photographers to shoot under extreme lighting conditions, while providing an opportunity for faster shutter speeds under normal lighting conditions.
The optical design of this model includes a replica aspherical lens. Canon has bypassed the expensive process of polishing glass to create aspherical glass and replaced it with a special coating technique which matches the optical quality of aspherical lenses. The result is an extremely high quality lens at a lower cost than with traditional manufacturing methods.
The aspherical design also makes the lens more compact -- less than 2-1/4 inches long -- and significantly reduces spherical aberration and sagittal flare. The lens design provides an extremely close focusing distance of less than 10 inches, the shortest in its class Unlike most conventional wide angle lenses, the front lens group in the EF 28mm f/1.8 is fixed and does not rotate during focusing. As a result, polarizing and special effects filters do not need to be adjusted after focusing The Canon EF 28mm f/1.8 wide angle lens weighs just 10.9 ounces and measures 2-3/16 inches long.
Type: Wide-angle Fixed Focal Length Construction 10 elements in 9 groups Angle of View 75< Minimum Aperture f/22 Minimum Focusing Distance 9.84 in. (0.25m) Maximum Magnification 0.18x Filter Size 58mm Function AF, AE Operation, Auto Aperture, Full Aperture Metering, Manual focusing also possible. AF Motor Ultrasonic Motor (USM) Diaphragm Pulse Control EMD (Electromagnetic Diaphragm) Coating Super Spectra Length 2-3/16 in. (5.56 cm) Weight 10.9 oz. (310 g) Lens Hood EW-63 Cap E-58U Case ES-C9 (soft) *Use of an EF 12 or EF 25 extension tube is possible