Sigma AF 24-50mm f/4-5.6 UC

Sigma 12-24mm On a full frame camera, 12mm-24mm is perfect for tight spaces, architecture, and wide angle shots. It has no fish-eye effect. Although not sharp at all at the edges, it is very functional in the middle 3/4's of the frame. I paid over $500. and I feel it is worth every cent. I do a lot of real estate shots, and it is perfect for what I do.

Extremely wide angle, full-frame lens. At f/ 4.5, not the fastest lens, but has reasonably good sharpness to the corners and does not seem to suffer from chromatic aberration. Care needs to be taken in daylight, as images close to or including the sun may produce halos or artifacts which are typical with nearly all ultra-wide angle lenses.

I can see everything Another Sigma lens that is built like a rock and weights as much. You can see the quality every time you shoot a picture