Closest Focusing Distance: 118.1 in; Diaphragm Blades: 9 Blades; Picture Angle: 5 - 14.5 degrees; Attachment / Filter Size: 86 mm; Macro Lens: Without Macro Lens; Groups / Elements: 13 Elements in 11 Groups
Sigma combined a five-lens group zoom system with an aspherical lens element when they designed the 170-500mm f5-f6.3 APO aspherical lens. This combination gives your images sharp high-contrast images throughout the entire zoom range. Its unique apochromatic lens design and three SLD glass elements help eliminate the vibrations usually found in ultra-telephoto lenses. Since the front lens group doesn't rotate, polarized filters are extremely easy to use. This lens also has a built-in rotary tripod mount to help keep the lens steady, reducing vibration during shutter release and keeping your images sharp and clear. This model is dedicated to Canon AF SLR cameras.
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