levinton wrote:
For me, such fisheye lenses are great for underwater photography. My favorite recent lens is the Lumix 8 mm, which is super sharp but also gathers light so beautifully underwater. This allowed an educational photo of coral dominating over 45 feet of vertical underwater depth. In the film days, a Nikon 15 mm lens allowed you to take closeups in 50 feet of water with no flash.