Rokinon 14mm F2.8 IF ED Super Wide-Angle Lens for Nikon AE with Automatic Chip: Technical Information Focal Length: * 14mm Aperture Range: * f/2.8 to f/22 Focus Distance: * 0.90" minimum Filter Attachment Diameter: * 87mm Lens Construction: * 14 elements in 12 groups Viewing Angle: * 115.7 degrees Physical Characteristics Dimensions: * 6.0" x 3.5" x 3.7" Compatibility: * Nikon AE cameras