[stoppingdown]

I've started doing a few tests yesterday with my new lens. For the first time I have a disappointed feeling about a new lens, even though in most cases they are related to defects that are well known from the review (and don't get me wrong, the lens is excellent for the price under many respects). It is something related to vignetting wide open, but not the regular one that I expected — to cut the story short, it's a strong horizontal vignetting that only appears at the lower border. Indeed a possibility is that it's related the fact that the mechanical vignetting seems not centered. I'm going to post a few samples below.

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Well, I'd like to post the photos, but it seems that attachments are not working...