Manual focus; Aperture range of F3.5-23. 11 Elements in 7 groups (1 spherical lens); minimum focusing distance of 1-Feet (12-Inch). Features built-in auto aperture and auto exposure chip for auto metering with your camera (only available for Nikon mount). Ultra-wide 167 diagonal field-of-view for APS-C size image formats will produce a rounded image that doesn't cover the entire frame when used with compatible full frame digital cameras or 35mm film cameras. Features improved HD optics for the sharper images / Lens not zoomable