I admit in this category I expected a dismal failure and everything indicated it. Firstly, you deal here with a fast lens with a wide angle of view. Secondly, it consists of as many as 12 elements in 10 groups, with 20 air-to-glass surfaces where you can catch unwanted reflections. Thirdly, the lens is small and it focuses internally, changing the optical system. That limits places where you can put inner apertures and baffles. Fourthly, the fledgling Chinese producers have got us used to the fact that they optimize their lenses to the performance against bright light rather poorly.
So much a theory. Now let's glance at photos below and take a reality check.
Near the maximum relative aperture the performance of the tested Viltrox is very good. Some problems appear only on significant stopping down of the aperture. Still, these problems appear almost only when the sun is situated right outside the frame corners. In such a geometric combination the corner can be overexposed by an elongated flare that with very slight changes of the frame might change its colour, size, and intensity.
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At the same time, it is worth mentioning that regardless of the position of the sharp light source, the tested Viltrox is able to produce very contrasting images.
