Rokinon AE14M-C 14mm f/2.8-22 Ultra Wide Angle Lens with Built-In AE Chip for Canon EF Digital SLR Features built-in AE chip for auto metering with Canon DSLR cameras Aperture Range: F/2.8 - F/22 Compatible with both full frame and APS-C cameras Minimum Focusing Distance of 10.8 inches. 6 Diaphragm Blades Focus Type : Manual Focus