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Sigma 8mm f/3.5 EX DG Circular Fisheye Lens for Sigma SLR Cameras

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Product Description This circular fisheye lens produces circular images with an angle of view of 180? when attached to a full-frame digital SLR or 35mm film SLR camera. It has a fast maximum aperture of F3.5 and a minimum focusing distance of 13.5cm (5.3"). Sigma's super multi-layer coating and Special Low Dispersion (SLD) glass provide excellent image quality for digital and film SLR cameras. The special fisheye design allows maximum creative expression.This lens is perfectly suited for low light conditions indoors or at dusk. Special Low Dispersion (SLD) glass offer effective compensation of color aberration. Sigma's super multi-layer lens coating reduces flare and ghosting, a common problem with digital cameras and also creates an optimum color balance.Due to the quantifiable angle/area relationship it produces, this lens can be used for scientific applications such as solid angle measurements of cloud distribution over the sky, or vegetation distribution of the rain forest canopy.