The Ultra Wide Angle Lens is one of the most important lenses that every photographer can have in his camera bag. There are many costly ultra wide angle lenses in the market, varying in price from hundreds to a few thousand dollars. However, these Uwa lens are not perfect. They suffer from dramatic barrel distortion, poor peripheral sharpness or huge physical size. Venus therefore spent a lot of time to come up with a design which is truly perfect and overcome the frustration of photographers. That's where the Laowa 12mm f/2.8 Zero-d comes from.Ultra Wide Angle lenses in the market tend to suffer an optical distortion rate from 2% to 5%, which causes straight lines to bend. The Laowa lens features a close-to-zero distortion rate that you can barely notice with your eye.( The aforementioned close-to-zero distortion rate is measured from shooting objects at infinity focus. The distortion rate may vary for shorter object distance.