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A world quality super-wide-angle lens with the fastest lens speed of F/3.5 in its class. Because it is a retrofocus type, through-the-lens focusing can be performed, and the entire 96-degree field of view can be recorded on film. Optically, the various aberration compensations are excellent. It is especially free of astigmatism and image distortion is held to less than one per cent. Therefore, clear and sharp images are possible to the outermost edges, and overall sharpness is superb. This is a professional quality lens. FEATURES: * Construction: 11 elements in 9 groups * Coating: Amber and Special with double layers * Diaphragm: Automatic/Manual pre-set type * Minimum aperture: F/16. * Filter size: IX * Weight: 17 5/8 oz.