Canon EF

2024-03-02 16:41| 来源: 网络整理| 查看: 265

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First announced in August 2004 to coincide with the launch of the EOS 20D, the EF-S 17-85mm F4-5.6 IS USM is Canon’s logical upgrade from the basic 18-55mm kit lens supplied with its APS-C dSLRs. With a 35mm-equivalent focal length of 27-136mm, it covers a decent wideangle to telephoto range, making it a useful ‘walkaround’ lens which will cover a wide range of photographic opportunities. It also sports Canon's 2nd-generation optical image stabilizer, which allows hand-holding at slower shutter speeds than usual before the image-degrading effects of camera shake become apparent. This lens is clearly an attempt by Canon to replicate the success of their earlier 28-135mm F3.5-5.6 IS USM, which gained a strong reputation as an excellent performer on 35mm film; so is the 17-85mm up to scratch?

Headline features 27-136mm equivalent focal length range; F4-5.6 maximum aperture Optical image stabilization – 3 stops Ring-type USM focusing with full-time manual override EF-S mount for Canon APS-C dSLRS only Angle of view

The pictures below illustrate the focal length range from wide to telephoto:

17mm (27mm equivalent) 85mm (136mm equivalent) Canon EF-S 17-85mm 1:4-5.6 IS USM specifications Street price • US: $520 • UK: £360 Date introduced August 2004 Maximum format size APS-C Focal length 17-85mm 35mm equivalent focal length (APS-C) 27-136mm Diagonal Angle of view (APS-C) 78º - 18º Maximum aperture F4-5.6 Minimum aperture F22-32 Lens Construction • 17 elements/12 groups • 1 Aspherical element Number of diaphragm blades 6 Minimum focus 0.35m Maximum magnification 0.20x at 85mm AF motor type • Ring-type Ultrasonic Motor • Full-time manual focus Focus method Internal Image stabilization • 3 stops • Single mode (no panning) Filter thread • 67mm • Does not rotate on focus Supplied accessories • Front and rear caps Optional accessories • EW-73B Hood • LP1116 Case Weight 475 g (16.7 oz) Dimensions 78.5 mm diameter x 92 mm length (3.1 x 3.6 in) Lens Mount Canon EF-S only Other Supplies distance information for E-TTL II flash metering

* Supplied accessories may differ in each country or area

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