Sigma 150 mm f/2.8 APO EX DG OS HSM Macro
9. Ghosting and flares
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I must honestly admit that in this category I didn’t expect any problems. Sigma lenses usually perform very well against bright light and additionally in this case the longer focal length made any slip-ups even less probable. A huge, not sheltered front element makes itself felt, though, and flares in certain circumstances can be easily caught. Apparently Sigma was aware of the problem, adding a big hood and a special hood extension for photos taken on APS-C/DX sensor reflex cameras with the lens.
Defending the tested lens a bit you can say that a macro device with such a focal length is hardly ever used with the Sun near the frame corner and, after all, the problems, presented below, can be experienced only in such a situation.
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