Sony 16mm F2.8 Fisheye
Description (from B&H): The 16mm f/2.8 Alpha A-Mount Fisheye Lens from Sony is a full-frame fisheye that provides your camera with a wide 180° angle of view. With such an exaggerated perspective and intriguing visual distortion, this fisheye lens brings images closer to the focal plane for a view beyond the ability of the human eye.
In addition to eye-catching interpretations of reality, it offers extended depth of field so that you can capture huge vistas in which everything from 20 centimeters to infinity is in focus, even at its maximum f/2.8 aperture. A built-in lens hood forms an integral part of the lens barrel, keeping reflections to a minimum without getting in the way of the super wide 180° view. Four selectable internal filter settings are also built right into the lens, including: normal, O56 monochrome, B12 red reduction and A12 blue reduction for even greater creative effects than are already offered.