>>4318453Not him but I have a superwide I use for underwater photography, a Sigma 14/2.8 EX.
Underwater, light behaves differently. Because of this, a 35mm lens views like a 50 in the water. My 14 looks more like a 20 in the water. This is a great example of this phenomenon. The top half is 28mm but the bottom half views like a 40.