17-35mm F2.8-4 Di OSD - Canon EOS
The 17-35mm F/2.8-4 Di OSD is an ultra-wide-angle zoom lens that combines superb image quality with outstanding portability and is the lightest and smallest size in its class.
It uses four LD (Low Dispersion) lens elements to minimize axial chromatic aberrations. With two GM (Glass Moulded Aspherical) lenses, it provides the sharpness and contrast demanded by high-end lenses and can also handle peripheral point image reproducibility. Furthermore, this lens has repeatedly gone through Tamron's proprietary ghosting analysis simulation which is employed to resist backlighting problems from strong light sources to which wide-angle lenses are often subjected.
Along with an enhanced high-level optical construction, the lens has BBAR (Broad-Band Anti-Reflection) Coating, which is highly effective in reducing reflection and controlling ghosting and flare. The front lens element is coated with a protective fluorine compound that is water and oil-repellent. This makes the lens surface easier to wipe clean and less vulnerable to the damaging effects of dirt, dust, moisture and fingerprints.
Moisture-Resistant Construction and leak-proof seals in the lens barrel protect the lens when shooting outdoors. The Minimum Object Distance (MOD) is a close 28cm throughout the entire zoom range. You can enjoy pleasing bokeh (background blurring) when shooting at wide-open aperture with this ultra-wide-angle zoom, thanks to the rounded aperture blades.
Features / Tech Spec:
Filter Size: 77mm
Length (from camera mount): 92.5mm, Max. Diameter: 83.6mm
BBAR coating, Fluorine coating, Moisture-resistant construction
Maximum aperture: F/2.8-4, Minimum aperture F/16-22
Diaphragm: 7 rounded blades
Lens Construction: 15 elements in 10 groups
OSD (Optimized Silent Drive) for fast, quiet autofocus
Minimum Focus Distance: 28cm throughout entire zoom range
Max. Magnification Ratio 1:4.9 @ 35mm
Angle of View (diagonal): 103°41' - 63°26' (full-frame sensor), 78°46' - 43°29' (APS-C sensor)