The Samyang 8mm f3.5 UMC Fisheye CS II Lens gives you a 167° view with dramatic, exaggerated perspective when used with an APS-C camera, or a powerful circular image floating in the frame when used with a full frame digital camera or 35mm film camera. With hybrid aspherical lenses and multi-layer coating, you will produce sharply defined images with a minimum of flare and ghosting. The 8mm lens focuses as close as 12" (30.48 cm) from the lens. This version of the 8mm f/3.5 Fisheye lens comes with a removable lens hood that provides glare reduction and lens protection, but can be removed to offer an increased and unobstructed angle of view when shooting at full frame digital or 35mm. Features of the Samyang 8mm f3.5 UMC Fisheye CS II Lens Ultra Wide-Angle 8mm Fisheye Lens 167° Angle of View High Definition, Aspherical Optics For Use with APS-C and Full-Frame DSLR's Multi-Layer Coating to Reduce Flare Minimum Focusing Distance of 12" Removable Petal-Type Lens Hood Fisheye Lens Ultra-wide angle lens covering up to 180°. Minimized Flare and Ghost Effects with Ultra Multi Coating By reducing the impact of flares and ghosting effects in your pictures while ensuring excellent image quality and contrast from the center to the periphery, it offers crystal clear, sharp image quality. Smooth Focus Ring Smooth focusing ensures precise control and produces images with incredible sharpness, making it the ideal choice for indoor and night shooting. Specifications of the Samyang 8mm f3.5 UMC Fisheye CS II Lens Lens type Prime lens Focal length 8 mm Image stab. No Lens mount Pentax K Max aperture F3.5 Min aperture F22 Min focus 0.30 m (11.81′′) Weight 443 g (0.98 lb) Length 77 mm (3.04′′) For a more detailed specification about the Samyang 8mm f3.5 UMC Fisheye CS II Lens see here. for more Samyang lenses see here.