L-series construction and optics f/2.8 aperture throughout zoom range Fast, quiet auto focus Aspherical and UD lens elements Super Spectra coatings Circular aperture for excellent bokeh Passes distance information to E-TTL II Soft case and lens hood
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| EF16-35mm f/2.8L II USM |
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| Photo 1: EF 16-35mm f/2.8L II USM |
Development objectives Developed as the successor to the EF 16-35mm f/2.8L USM, which was first released in 2001, to an even higher standard of performance, the EF 16-35mm f/2.8L II USM (Photo 1) is a large aperture (f/2.8) ultra-wide-angle zoom lens. The following sections highlight some of the aims of the lens's development. Feature 1: 16-35mm ultra-wide-angle zoom range The lens's zoom assembly consists of four lens groups, all of which move, and employs a new type of inner-focusing system, in which some of the elements in the second group act as the focusing group. The zoom assembly was completely redesigned to deliver improved image quality over the previous model while covering the same zoom range, from 16mm, at the ultra-wide-angle end, to 35mm (Figure 1). |
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| Figure 1: Optical assembly of the EF 16-35mm f/2.8L II USM |
Feature 2: Pursuit of image quality improvements over previous models The lens consist of 16 lens elements in 12 groups. The design is notable because it features three types of precision aspherical lens elements (one ground, GMo (molded glass), and replica aspherical element each) that provide excellent aberration correction, which gives the lens image quality fitting for an L-series lens at all zoom focal lengths. In particular, the new lens offers improved peripheral image quality at wide angles over the previous lens. The lens also includes two UD elements that greatly minimize the inherent lateral chromatic aberration found in wide-angle lenses, achieving superb image quality with excellent resolution and contrast with virtually no color fringing at subject boundaries (Figure 2). |
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| Figure 2: MTF characteristics of the EF 16-35mm f/2.8L II USM |
| Bold lines: 10 lp/mm, fine lines: 30 lp/mm. Black lines are the MTF at full aperture; the blue lines at f/8. Solid lines represent sagittal (radial) MTF and the broken lines represent meridional (tangential) MTF. |
Feature 3: Superior waterproof and dustproof construction Waterproof and dustproof construction (Figure 3) at the mount, switch and switch panel, zoom ring, and focusing ring prevents dust and moisture from getting into the lens, making it suitable for use in harsh conditions. |
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| Figure 3: Waterproof and dustproof construction on the EF 16-35mm f/2.8L II USM |
*Be sure to use the lens with a weatherproof/dustproof body. A Canon filter must be attached to the front of the lens for full protection. |
Feature 4: Optimal optics for digital SLRs The lens configuration and coating have been designed to minimize the flare and ghosting found in digital SLRs due to surface reflections from the imaging sensor. The configuration and coating also ensure excellent color balance. Other features • Manual focusing in AF mode After the one-shot AF operation, the full-time mechanical manual focus construction allows the user to continue to focus manually without leaving the AF mode. • Fast, silent autofocusing The ring USM, high-speed CPU, and optimized AF algorithms enable fast, silent autofocusing. • Minimum focusing range of 0.28m The minimum focusing range is 0.28m at all focal lengths. The maximum magnification is 0.22 (at 35mm). • Circular aperture produces beautiful bokeh The lens features an electro-magnetic diaphragm with a circular aperture that provides attractive bokeh (blurring effects). • Redesigned switch shape prevents accidental mode changes The focus mode switch has been reshaped to prevent the switch from being moved accidentally while carrying or shooting. • Enlarged, petal-shaped hood provides more effective light blocking Flocking on the inner surface of the enlarged, petal-shaped EW-88 hood gives much better anti-reflective performance, greatly cutting harmful reflections (Photo 3). |
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| Photo 3: EX-88 hood for the EF 16-35mm f/2.8L II USM |
• Two new filters Canon has designed two new 82mm filters - PROTECT and the PL-CB circular polarizer. Attaching either filter to the front of the lens adds additional water and dust protection (Photo 4). |
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| Photo 4: 82mm PROTECT filter (top) and the PL-CB filter |
• Environmentally friendly design The lens optics use only lead-free glass in consideration of our natural environment. Furthermore, the lens design meets the environmental requirements of the European Union's RoHS Directive (Directive on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment). |
