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Sigma 100-300mm f/4 EX HSM

Sigma 100-300mm f/4 EX HSM Specifications
Frame Coverage 35mm
Lens Construction (groups) 16
Lens Construction (elements) 14
No. of Diaphragm Blades 9
Minimum Aperture 32
Closest Focusing Distance 1.8m (70.9")
Maximum Magnifcation 0.20x
Filter Diameter 82mm
Maximum Diameter x Length 92.4mm x 226.5mm (3.6" x 8.9")
Weight 1440g (51oz)
Source
Photodo.com
The constant aperture and faster, quieter autofocusing make all the difference, ably helped by a constant length and internal focus mechanism to make handling a joy. Four SLD glass elements in the construction help to make a nice improvement to the output quality too.
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