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Up until now I have been a Nikon purist - I wanted everything to be pure Nikon. I bought this lens because it was $300 cheaper than the Nikon 16mm Fisheye and it is every bit as good! I have not been disappointed yet!

I purchased this lens for my 5D MIII primarily for events, weddings, architecture, etc. I was hesitant to purchase an off brand lens, but Sigma has...

Great image quality; solid build quality

I was looking for an FX fisheye to replace my DX Nikon 10.5 Fish and it came down to this lens or the Nikon 16 f/2.8. The Nikon was over $200 more expensive and most reviews said this lens was slightly sharper. Both had the same 180 degree view somehow.

Very sharp; Easy to use; small and light weight

Tendency to overuse

Compatible with both full-frame and cropped-sensor bodies, this fisheye is attractively priced and performs well

Fisheye effect

Fiddly to use

I love shooting wide and for years I've loved the Nikon 10.5 fisheye on DX. So when I moved to FX I needed a new fisheye. The 10.5 works on FX but doesn't utilize the whole sensor. This Sigma is wonderful and gives me all the performance of the 10.5 in terms of sharpness, close focus, and color.

Stellar performance for a fisheye lens. The lens is bright & fast. It's really fun to use. Simply set it in f/5.6 - f/8 and voila, all sharp images across the frame. I mostly use this lens for film (on my F75 or F90x). It brings great color saturation, sharpness & contrast across the images.

price; image quality; build quality

bad finishing (body) paint

Sigma's 15mm F2.8 EX DG Diagonal Fisheye is a diagonal fisheye which means the distorted scene is shown full frame within the camera's field of view. It allows photographers to shoot creative images by taking advantage of the acute perspectives that are invisible to the human eye.