Not bad but at 16mm extreme vignetting

I have had the lens as kit lens for my Alpha 6000 here. Basically, the lens is not poor in sharpness, size, weight and focus. But this I can not stand here not enter because there is a point which spoils the fun of Shard tidy.

I do not know if the only copy my concerns but at 16mm wide angle and quite far closed aperture (iris from 8 approx) occur each image in the top left and right extreme vignetting on. These are not light shadows, the corners are completely black.
Small consolation that Lightroom knows the Objekiv and corrected these flaws in the Lens Correction. Since this is done automatically, I'm cheeky assume that this is a known problem of this lens. When the aperture is below 5.6 I have not tested it yet, because I have so far largely photographed landscapes.

In my opinion, an absolute no go!

3 stars there is, because it's my opinion for all other focal lengths / aperture combinations a pretty good job.