The flares are not especially pronounced on full frame but, paradoxically, all the credit shouldn’t go to excellent coatings or perfect blackening but rather to huge vignetting. When you put the sun in the frame corners its brightness is weakened by as much as 4 EV and the flares generated in the opposite corner are damped down by a similar value.
That’s why in this case it’s better to assess the performance of the coatings by consulting photos from the Canon 50D with a smaller sensor. There are some flares there but their number is not especially high. Overall the Canon EF 16–35 mm f/2.8L III USM compares favourably to its rivals such as the Tokina 16–28 mm or the Tamron 15–30 mm in this category; it is also slightly better than its slower brother.
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