Sigma 4.5mm f2.8 EX DC HSM Circular Fisheye Lens for Nikon. The Sigma 4.5mm fisheye lens is a high quality full 180 degree circular fisheye lens for Nikon digital SLR cameras. The Sigma fisheye lens is equipped with an inner focusing system that creates high definition and excellent image quality over the whole frame. The HSM (Hyper Sonic Motor) ensures fast and quiet autofocusing and allows full-time manual focus override by rotation of the focus ring. Designated with Sigma's 'EX' finish, the Sigma 4.5mm fisheye is one of Sigma's superior performing lenses, and of high build quality.
Excellent image performance from SLD (Special Low Dispertion) Glass, a bright f2.8 aperture, and high speed autofocus with Sigma's HSM (Hyper-Sonic-Motor), a manual focus override with manual focus ring, and, and close focusing to just 13.5cm. The Sigma 4.5mm fisheye give a full 180 degree circular fisheye view, and features close focusing to just 13.5cm. The Fisheye perspective is great for extreme wide angle, and special effects, including 360 degree panoramas when used with various specialised panoramic software from certain software manufacturers.
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