The resistance of the lens to flares is very poor without the supplied lens hood. The photo made by me a couple years ago on Canon 5D mark II and another copy of Cosina AF 19-35mm F/3.5-4.5 MC clearly shows the problem:
The full set or problems occur here: the decrease of overall contrast, the sun’s reflection on the water surface (!) and the flares from the sun located outside the frame (!!). I strongly recommend not to shoot with this lens without dedicated lens hood under any lighting conditions, as the flares may arise even from the artificial light sources (lights, lamps etc).
The resistance to flares becomes much better with supplied round lens hood. However slightly decreased contrast can be observed in some cases anyway.
Colored flares appear when the sun is located near the corner or edge of the frame. The flares can be of different sizes (sometimes they are even large) and various intensity. Beautiful rainbow flares appears in some cases (rainbow effect free of charge). Most of the problems occur near the focal length of 19 mm.
Looks like that Cosina’s proprietary multi-layer coatings were optimized to provide the best possible light transmission at the expense of resistance to flares. That’s why the shots from this Cosina are so bright and saturated.
To summarize: this lens will «willingly» spoil the pictures taken in the conditions when the sun is near the edge of the frame, or even a bit beyond. Try not to shoot against the sun, and certainly never put it in the frame.
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