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The Sigma 15mm f/2.8 EX DG Diagonal Fisheye is a full-frame fisheye auto focus lens that fills the entire 35mm negative with a full 180 degree diagonal field of view.
This 50-500mm f/4.5-6.3 APO DG OS HSM Lens for Pentax K from Sigma is a zoom lens for digital SLR cameras which provides a standard to ultra telephoto zoom range that is ideal for nature, wildlife, or sports photography.
Sigma's 70-300mm f/4-5.6 APO-M DG Macro Lens is a compact Apochromatic tele-macro zoom lens incorporating two Special Low Dispersion glass elements in the front lens group, plus one Special Low Dispersion glass element in the rear lens group.
The Sigma 70-300mm 4-5.6 DG Macro lens is the compact and economical choice for a telephoto zoom lens. Capable of macro photography, this lens has a 1:2 maximum close-up magnification at the 300 mm focal length.
The Sigma 18-35mm f/1.8 DC HSM Art Lens for Pentax is a wide-angle to normal-length zoom lens that features a fast, bright constant f/1.8 maximum aperture.
With a 16.6x zoom ratio covering focal lengths from wide to telephoto, this lens also offers a 1:3 macro ratio