My friend recently gave me his old Canon 5D (not Mark II). So I went online to find myself a lens, and after much comparing, decided to get the - Tamron 18-277mm F/3.5-6.3 Di II VC PZD lens which had gotten pretty good reviews. It says it's "for Canon", so I noobly figured the two are compatible. Then the problem comes...there's no issue mounting the lens, but when I look into the viewer, i see a dark ring around the 4 sides of the images, so my images...not sure how to describe it...look like they're taken through "tunnel vision"?
Is this a matter of wrong lens? or there's something about the setting?