Canon EF Autofocus Lenses Canon's reputation for excellence in optics has been well established for years. And with the introduction of EF lenses for the EOS, it's only getting better. EF Lenses have the largest diameter mount of any 35mm camera, which not only strengthens the whole system, but permits optical innovations never before possible. L-Series lenses have better sharpness and contrast because Canon uses aspherical elements to eliminate spherical aberrations. In addition, the L-Series telephotos use UD (Ultra-low Dispersion) glass to reduce chromatic aberration resulting in more accurate colors. A built-in Ultrasonic focusing Motor (indicated by USM) provides pro-quality AF speed with split-second accuracy. Telephoto lens with a softfocus feature. It can give razor-sharp snapshots as well as softfocus shots that do not look blurry. You have a choice of two softfocus settings. Even for softfocus shots, focusing with AF is quick and accurate. Item Specifications: Product Description: Canon EF soft focus lens - 135 mm Lens System: Soft focus lens Mounting Type: Canon EF Lens Aperture: F/2.8 Focal Length: 135 mm Min Focus Range: 4.3 ft Focus Adjustment: Automatic, manual Lens Construction: 6 group(s) / 7 element(s) Special Functions: Softfocus Filter Size: 52 mm Length: 4 in Weight: 13.8 oz