LAKE SUCCESS, N.Y., August 17, 1995
Canon U.S.A., Inc. is introducing the first interchangeable lens with optical image stabilization designated specifically for EOS SLR cameras. The Canon EF 75-300mm f/4-5.6IS USM lens uses gyro sensors and a counteracting, image-stabilizing lens group moving in parallel to achieve this milestone in imaging technology. Until now, this technology was available only in Canon 8mm camcorders, dedicated lenses for its L2 Hi-8 camcorder and its 12 x 36 IS binoculars.
The new lens allows photographers to extend hand-held exposure range by up to two EV steps, allowing greater mobility by avoiding the need for a tripod. Incorporated into an EF lens for the first time, a high-speed, 16-bit microcomputer is used to control the image stabilizing feature, autofocusing and the aperture. When the image stabilizer is turned off, a center-locking mechanism locks the image stabilizing lens-group in place.
"Canon's new Image Stabilizing lens for EOS System cameras illustrates the company's commitment to offer the most advanced imaging technology to photographers to help them realize their visions through photography," said Hank Maeda, vice president and general manager for Canon's Camera Division. "We feel we have developed a lens that will answer the needs of thousands of photographers worldwide," Mr. Maeda explained.
The new image stabilizing lens dramatically reduces the risk of getting blurred images, especially when shooting at long focal lengths with slow shutter speeds. The traditional rule for preventing blurred images when photographing at long focal lengths is that the shutter speed should be set faster than the reciprocal focal length in use. For example, using a focal length of 200mm, it is recommended to use a shutter speed of 1/250 second or faster to achieve sharp results. In many cases, photographers are forced to reduce the depth-of-field to gain a faster shutter speed or to use a tripod in situations where its use can become quite cumbersome.
The EF 75-300 f/4-5.6 Image Stabilizing lens allows photographers to hand-hold the camera using long focal length lenses up to two stops beyond the "focal length = shutter speed" formula. Photographers can now enjoy shooting at a 200mm focal length hand-held at 1/60 second. This process is attributed to a 16-bit micro-computer which controls a series of gyro sensors and micro-motors designed to shift one of the lens groups to compensate for camera shake. The Image Stabilizing feature can be activated and deactivated using a switch located on the lens barrel. The stabilizing effect can actually be viewed through the viewfinder.
Powered by Canon's exclusive Ultrasonic (USM) motor for autofocusing, the lens is silent and very quick to focus, even in low- light conditions. The powerful 4:1 zoom ratio makes it an ideal lens for a number of shooting situations including sports, portraits, landscapes and photojournalism. Extended to its maximum focal length, the lens provides a magnification of 0.25x making it a good choice for close-ups. The new lens also uses environmentally-safe lead-free glass throughout the lens' optical system.
The Canon EF 75-300mm f/4-5.6IS USM Image Stabilization lens weighs 23.5 ounces and measures 5-7/16 inches in length.
Type Telephoto Zoom with Image Stabilization Construction 15 elements in 10 groups Angle of View 32 - 8 degrees Minimum Aperture f/32-45 Minimum Focusing Distance 59 in. (1.5m) Maximum Magnification 0.25x Filter Size 58mm Function AF, AF Stabilization, AE Operation, Auto Aperture, Full Aperture Metering, Manual Focusing also possible AF Motor Ultrasonic Motor (Micro USM) Diaphragm Pulse Control EMD (Electromagnetic Diaphragm) Coating Super Spectra Length 5-7/16 in. (137.2mm) Weight 23.5 oz. (670g) Lens Hood ET-64 Cap E-58U Case LH-D18B (hard) *Use of an EF 12 or EF 25 extension tube is possible