วันพุธที่ 28 กันยายน พ.ศ. 2554

Canon EF 70-200mm f/4 L IS USM Lens for Canon Digital SLR Cameras (Electronics)

Canon Ef 70-200mm F/4 L Is Usm Lens For Canon Digital Slr Cameras from Canon

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Canon Ef 70-200mm F/4 L Is Usm Lens For Canon Digital Slr Cameras

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Details

Canon EF 70-200mm f/4L IS USM lens 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 200mm without having to decrease shutter speed. Developed for use with a Canon SLR camera, this autofocus telephoto zoom lens offers optimized use with the Canon EOS series digital cameras. Of particular note, Canon has introduced an image stabilizer (IS) that adjusts to meet the demands of professional photography. IS reduces dramatically the 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. For shooting immobile subjects, Mode 1 corrects for movement in the image along both the horizontal and vertical axes. For shooting while panning horizontally to follow a moving subject, Mode 2 turns off vertical correction and prevents the effect of dragging the subject back through the frame. The lens' Ring-type USM employs ultra-sonic frequency vibrations to drive auto focus with unrivalled speed and near-silent operation. A powerful CPU and improved AF algorithm contribute to speed performance. The EF 70-200mm f/4L IS USM includes distance metering information, providing compatibility with the E-TTL II flash system of late model cameras such as the EOS-1D Mark II, EOS-1Ds Mark II, EOS 5D and EOS 400D. When used in conjunction with Canon's range of EX Speedlite flash units, the lens passes distance information to the flash algorithm for markedly improved flash exposure metering. Includes Lens hood and soft pouchCapture the far-off action of fast-paced sports or zoom in for an intimate portrait with the Canon EF 70-200mm telephoto zoom lens. The L-series lens offers an Image Stabilizer that provides up to four stops of shake correction--a first for Canon IS lenses. The use of fluorite UD lens elements, meanwhile, produces an excellent optical performance in terms of resolution and contrast. Add in a sturdy housing with water- and dust-proof construction and you have a lens that's both portable and high performing. Other details include an f/4 maximum aperture, a ring-type ultra-sonic monitor (USM) that enables quick and quiet autofocusing, compatibility with circular polarizing filters, and a lightweight body. The lens carries a one-year warranty.

  • Focal length: 70-200mm
  • Maximum aperture: f/4
  • Lens construction: 20 elements in 15 groups
  • Diagonal angle of view: 34 to 12 degrees (with full-frame cameras)
  • Focus adjustment: AF with full-time manual focus
  • Closest focusing distance: 3.94 feet
  • Zoom system: 7-group helical zoom (72-degree rotational angle)
  • Filter size: 67mm
  • Dimensions: 3 inches in diameter, 6.8 inches long
  • Weight: 26.8 ounces
Canon EF 70-200mm f4L USM lens
MTF Charts
Features: 70-200mm telephoto zoom lens with f/4 maximum aperture for Canon digital SLR cameras, Fluorite UD lens elements produce excellent optical performance in resolution and contrast, Ring-type ultra-sonic monitor (USM) for quick and quiet autofocusing; lightweight construction, Image Stabilizer provides up to 4 stops of shake correction; water- and dust-proof construction, Measures 3 inches in diameter and 6.8 inches long; weighs 26.8 ounces; 1-year warranty more...

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