Lens canon ef-s 17-85mm f4-5.6 is usm đánh giá

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Ống kính Canon 17-85mm F4-5.6 IS USM là sư nâng cấp hợp lý của Canon từ ống kính kit 18-55mm cơ bản được cung cấp với cảm biến APS-C của máy ảnh dSLR. Với chiều dài tiêu cự trên máy crop tương đương 27-136mm, bao gồm một góc rộng đến tele khá tôt, ống kính này sẽ bao gồm nhiêu tính năng là cơ hội chụp ảnh khá lý tương. Cho phép tay giữ ở tốc độ màn trập chậm hơn bình thường trước khi hiệu ứng hình ảnh tôt của máy ảnh khi chụp rung trở nên rõ ràng. Ống kính này rõ ràng là một nỗ lực của Canon để nhân rộng thành công của họ trước đó 28-135mm F3.5-5.6 IS USM.

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:

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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This is what happens when a Canon 17-85mm F4-5.6 lens meets 60,000 PSI of water pressure. Spoiler Alert: the water jet always wins.

Canon has today announced two new digital SLR lenses and a flash with digital features. The EF-S 17 - 85 mm F4 - F5.6 IS USM lens (US$600) provides an equivelant field of view of 27 - 136 mm (5x zoom), the EF-S 10 - 22 mm F3.5 - F4.5 USM lens (US$800) provides and equivelant field of view of 16 - 35 mm. Currently these new lenses can only be used on the Canon EOS 20D and EOS 300D digital SLR's (the only camera's to support EF-S lenses). Additionally Canon has also announced the Speedlite 580EX flash (US$480) with digital specific features such as zoom linked to sensor size and control of camera white balance.

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