The EF-S series Canon targets are outstanding targets for Canon digital SLR camera like the EOS 20D and Rebel models. Why? The main functions of the sensor design with APS-C-imaging with the image circle. How? This adaptation, by reducing the distance between the back of the goal and Fokalebene, ie reducing the size of the image circle.
The result? Canon EF-S are more effective with regard to the weight and cost for wide-angle lens and superior image quality, resolution and contrast at all focal lengths.
As a member of the EF-S family, goals 17-85 F4 IS USM is a great price telephoto. The list of features: image stabilization to the situation and it is optically optimized for digital SLR camera, a ring type USM quick and silent. The full-time manual focus in AF mode is also useful.
The EF-S 17-85mm f/4-5.6 IS USM offers a 5x zoom lens and an image at an angle of 27-136mm lens camera 35 mm. Again, the goal is a form of pieces of glass aspherical lens with aspherical surfaces on both sides. The result, the quality of picture of the zoom range. The Fokussierabstand is impressive at a distance of 12 cm at all focal lengths. Finally, the EF-S 17-85mm IS objective, compared with the EF 28-135mm IS lens, 5% length and 12% lighter, and accepts 67mm filters.
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