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Tuesday, November 30, 2010

Canon EF-S 17-85mm F/4-5.6 IS USM





DESCRIPTION

EF-S Lenses
By reducing the distance from the rear of the lens to the focal plane and reducing the size of the image circle to match the size of the APS-C imaging sensor used in digital SLRs such as the EOS 20D camera and Digital Rebel camera,Canon's EF-S lenses reduce the size, weight and cost of wide-angle lenses for these cameras while at the same time producing high image quality with superb resolution and contrast at all focal lengths.

EF-S 17-85 F4 IS USM
This new EF-S lens brings true wide-angle to telephoto coverage to EOS 20D camera and Digital Rebel camera photographers. It features Canon's Image Stabilization system, allowing safe hand-held photography at shutter speeds up to three steps slower than otherwise possible. And of course, it's optically optimized for digital SLRs. A ring-type USM delivers fast and silent auto focus, as well as full-time manual focus when in the AF mode.

The EF-S 17-85mm f/4-5.6 IS USM lens provides a 5x zoom ratio and an angle of view equivalent to a 27-136mm lens on a 35mm camera. The new lens also uses a glass-molded aspherical lens element with aspherical surfaces on both sides for superb image quality throughout the entire zoom range and it features a closest focusing distance of 12 inches at all focal lengths. The EF-S 17-85mm IS lens is 5% shorter and 12% lighter than the EF 28-135mm IS lens and accepts 67mm filters.

FEATURES
  • EF-S lens mount, exclusively for EOS 20D and Digital Rebel bodies
  • Excellent optical quality: Aspheric element with two Aspherical surfaces utilized
  • Close-focusing to 1.15 feet -- at 135mm, fills the frame with subject 3 x 4.4 inches
  • Ring-type Ultrasonic motor for superior AF performance; allows full-time MF
  • Image Stabilization extends the lens's usefulness in low-light levels
  • Circular aperture design -- natural highlights, even stopped down two stops
  • Non-rotating front element; lens length does not change during zooming
  • Compact, lightweight design with a 5x zoom ratio, 28 to 135mm equivalent

SPECIFICATIONS
Construction, 17 elements in 12 groups
Angle of view, Diagonal Angle of View: 78° 30' - 18° 25'
Closest Focusing Distance, 0.35m - 1.15 ft.
Filter Size, 67mm
Dimensions (Length x Diameter), 3.6" x 3.1" / 92mm x 78.5mm
Weight, 16.8 oz. / 475g

Conclusion - Pros
  • Decent build quality - much better than any of Canon's 18-55mm kit lenses
  • Very useful focal length range, almost ideal for a walkaround lens
  • Highly effective image stabilization
  • Excellent autofocus and manual override
  • Consistently high image quality across almost all of the range
Conclusion - Cons
  • Poor performance at wideangle, with marked barrel distortion, high levels of light falloff, and intense green/magenta chromatic aberration
  • Slow maximum aperture
  • Very average close-up performance

    2 comments:

    1. Rasanya pengen beli.... T_T
      tp........ lahaM<<<

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