Sigma 17-70 mm f/2.8-4.0 DC Macro OS HSM
9. Ghosting and flares
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Sigma lenses present a very interesting case when it comes to the work against bright light. Often we hear about sensational T* Zeiss or SMC Pentax coatings and about high standards which the constructors of the most expensive Canon and Nikon lenses, or even astronomically expensive Leica instruments, impose on themselves. Then it sometimes happens that we put these lenses on bodies and point in the direction of bright light with simply catastrophic results…
Meanwhile such a „Cinderella” as Sigma almost always has just a few problems in this category. The 17-70 mm OS HSM model is not an exception to this rule. Despite its fastness, a big number of optical elements and the wide angle of view the work against bright light is good. You can catch some light artifacts but they are mostly weak, not bothersome and independent of the value of aperture used. There is no significant overall contrast decrease either. The pictures below show it quite well.
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