Centre sharpness improves at all focal lengths by stopping the lens down from its maximum aperture to f/4 and f/5.6. The f2.8 zoom lenses are the essential equipment for many professional photographers. The lens delivers a strong set of mtf results from our image engineering tests.
Sigma 70200mm f/2.8 DG OS HSM Sport Review ePHOTOzine
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I was unfamiliar with the customization options that sigma's sports line offers, so i checked it out yesterday and put this together to show exactly how you.
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It has 22 elements, including one 'sld' and nine 'fld'. Sharpness holds up well at f/8 and f/11, but does starts to drop off beyond this point. Fresh discounts up to 70% off today. The fast constant f/2.8 maximum aperture excels in difficult lighting conditions and also offers increased control over depth of field for isolating subjects.
The lens is heavy, weighing in at a substantial 1805g, unsurprising considering its optical construction of 24 elements in 22 groups.
