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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)
The 100-300mm ƒ/4 is an interesting lens, about as large as a 70-200mm ƒ/2.8, but offering slightly more reach. Unfortunately, the performance of this sample is on par, and sometimes bested by, the consumer telezooms of its competitors.
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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