The Rokinon 8mm f/3.5 Aspherical Fisheye Lens is the most affordable 8mm Fisheye Lens in the market. It features the widest field of view over any other 8mm fisheye lens, and its build quality and optical construction are superb.
Rokinon 8mm F/3.5 Mirrorless Features
Ultra wide-angle 8mm fisheye lens with exaggerated perspective and approximately 180deg. angle of view, for dramatic effects
Ultra-wide 180deg. diagonal field-of-view for APS-C size image formats--will produce a vignetted rounded image that doesn't cover the entire frame when used with compatible full frame digital cameras
Lens is constructed with hybrid aspherical lenses for outstanding, sharply defined images
Lens features super multi-layer coating to reduce flare and ghost images
Lens has a minimum focusing distance of 12" (30.48 cm) for enhanced close-up shots