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[SweetSpot]

I recently acquired a Nikon 20mm f1.8 lens and it seems there could be a problem using on bright cloudless days. I noticed that images were slightly over expoing at the edges. I would accept lighter on one side depending upon the angle of the sun but this seems to be even when the sun is behind me. I've attached a couple of images as examples.

Any ideas as I'm baffled. BTW my closest wide angle to that is a 24-70 and that's fine.

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[Nikon Shooter]

I often use my 16mm for such scenes but without these consequences

A hood would produce a negative vignetting, not a positive one. To me,
it looks more like a polarising effect due to wrongly chosen — or often
ignored — Sun incidence.