It is beginning to look like Sigma is on course to release yet another groundbreaking lens in the coming months. This time it seems sigma will be announcing – according to the rumors – a 16-20mm F/2 lens in their Art line of lenses. An important point here is that this would be a full frame lens, unlike the 18-35 F/1.8, making it one of – if not the – fastest ultra-wide full frame lenses on the market (prime or zoom).