One of the widest lenses on the market today is the Laowa 12mm f/2.8 Zero-D, made by Venus Optics. Not only is this lens rectilinear (not a fisheye), but Venus Optics claims it has almost no distortion whatsoever. With so few 12mm lenses available today, anyone who needs an ultra-ultra wide has likely considered this one with some interest. Our review below covers everything you need to know about the 12mm f/2.8, both good and bad.