The Sigma 15mm F2.8 EX DG Diagonal Fisheye
A diagonal fisheye lens is a unique option for pros and enthusiasts who like interesting, more artistic shots. The 15mm F2.8 EX DG Diagonal Fisheye from Sigma lets you take advantage of acute perspectives that are invisible to the human eye.
Many wedding photographers, underwater photographers (flash onscreen: underwater usage requires special camera and lens housings), and indy sports photographers like this lens as it allows them to get the widest field of view possible with the signature fisheye barrel distortion effect.
Designed for use with full frame DSLRs, this lens has 180 degree edge-to-edge coverage, so you get that classic fisheye-distorted field of view, shown full frame.