The first fisheye lens developed exclusively for use with Nikon DX Format. Ultra wide picture angle of 180 degrees on DX sensor achieved by producing a smaller image circle (the size of the image that is projected by the lens on to the sensor) enabling smaller lens diameter, lighter weight and optimal image quality from center-to edge-to-corner on the image. Equivalent to 16mm focal length on 35mm. Close-Range Correction (CRC) provides high performance for sharper images when taking pictures up close. Design enables a combination of wider angle-of-view with optical characteristics that are optimized for Nikon digital SLR camera sensors. Nikon D-type design provides precise distance information for flash and ambient light exposure processes. Rounded diaphragm to make out-of-focus elements appear more natural. Fully Compatible with D1, D1X, D1H, D2H, D100, and D70.