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Sigma 300mm f/2.8 EX HSM

Sigma Sigma 300mm f/2.8 EX HSM Specifications
Frame Coverage 35mm
Lens Construction (groups) 9
Lens Construction (elements) 11
No. of Diaphragm Blades 9
Minimum Aperture 32
Closest Focusing Distance 2.5m (98.4")
Maximum Magnifcation 0.13x
Filter Diameter 46mm (rear drop-in filter)
Maximum Diameter x Length 119mm x 214.5mm (4.7" x 8.4")
Weight 2400g (84.6oz)
Our tests show the Sigma 300mm ƒ/2.8 to perform very well: sharpness is very good, CA is optimized for use at ƒ/2.8, there's virtually no distortion and light falloff is almost non-existent. Optically, the lens stands well on its own.
In terms of image and construction quality, in my opinion little or nothing at all is sacrificed by going the Sigma 300/2.8 HSM EX route. In fact, the design and operation of the tripod collar is better than the one on my Canon EF 300/4L.
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