Canon EF 70-200 mm f/2.8L USM
9. Ghosting and flares
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It is already a tradition that long and older L-series instruments have some difficulties with the work against bright light. You can hardly be pleased when you get such effects in your pictures as those, shown below.
The L-series fans will immediately answer that, after putting a lens hood on, these flares disappear or that they appear only in specific conditions. It is all very true. The problem is that the flares reflect badly on the quality of anti-reflection coatings, just average for contemporary standards. Bad coatings influence not only the work against bright light but also the transmission and that last parameter should be the highest in the highest class instruments after all.
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