Sigma 8mm F/4 Fisheye A Filtermatic Manual Focus Lens For Pentax K Mount With Normal Filter{ 22.5}

The Sigma Circular Image Fish-Eye 8mm F/4 Change your lens and you change your view of the world. And nowhere is this truer than with the exciting Sigma Fish-eye lens. This lens brings a 23mm circular image of its 180 degree angle-of-view coverage into your picture frame. One of the most compact lenses of its type, it features an easy, flexible, bayonet lock filter changing system. Angle of view: 180 degrees Optical construction: 11 elements in 7 groups Diaphragm operation: Automatic Filter size: 22.5mm Minimum focusing: 20cm Weight: 250 grams