2012年3月29日 星期四

Camera Lenses Reviews Canon EF 24-70mm f/2.8L USM Standard Zoom Lens for Canon SLR Cameras

Canon EF 24-70mm f/2.8L USM Standard Zoom Lens for Canon SLR Cameras

Canon EF 24-70mm f/2.8L USM Standard Zoom Lens for Canon SLR Cameras
  • EF mount; standard zoom lens; Comes with Lens Cap E77U, Rear Lens Cap, Lens Hood EW-83F, Soft Lens Case 1219.
  • Ultra-low Dispersion glass with Fluorite elements; inner focusing ring; full-time manual focus; aspherical lens
  • 24-70mm focal length
  • f/2.8 constant maximum aperture
  • UltraSonic Motor (USM) AF actuator
Canon EF 24-70mm f2.8L USM Lens

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Canon EF 24-105mm f/4 L IS USM Lens for Canon EOS SLR Cameras

Canon EF 24-105mm f/4 L IS USM Lens for Canon EOS SLR Cameras
  • 24-105mm standard zoom lens with f/4 maximum aperture for Canon EOS SLR cameras
  • 1 Super UD glass element and 3 aspherical lenses minimize chromatic aberration and distortion
  • Ring-type USM system delivers silent but quick autofocus (AF); full-time manual focus
  • Image Stabilizer technology steadies camera shake at up to 3 stops; weighs 23.6 ounces
  • Dust- and moisture-resistant; measures 3.3 inches in diameter and 4.2 inches long; 1-year warranty
The L-series is Canon's flagship professional lens range, designed to include outstanding image performance, ultimate operability and weather resistance. The EF 24-105mm f/4L IS USM offers a lightweight alternative to the renowned EF 24-70mm f/2.8L USM. offers the highest possible optical quality with no change in aperture over the full focal range of the lens. This allows photographers to set exposure at the widest aperture and zoom all the way through to 105mm without having to vary the shutter speed. Image Stabilizer (IS) dramatically reduces image blur caused by camera shake. Gyro sensors detect unwanted vibrations, triggering the corresponding movement of a correcting lens group perpendicular to the optical axis. This alters the light path, returning the image to its correct position on the sensor or film plane. The 3 stop advantage means that photographers normally shooting a 105mm lens handheld at 1/125 sec can obtain a shake free result with a shutter speed as low as 1/15 sec,

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