This ultra-wide-angle fisheye lens creates dramatic full-frame images ideal for super-wide-angle special effects, interesting interiors and close-ups. Full-frame, 180-degree fisheye coverage with Nikon's advanced D-type autofocus lens technology. High-contrast images even at full aperture. Nikon Super Integrated Coating for minimized flare and ghost providing good color balance. Bright f/2.8 aperture for photographing in dim light or with fast shutter speeds. Close-Range Correction (CRC) system provides high performance at both near- and far-focusing distances.
This is the magnifying factor of a lens. Macro lenses will often be described by their “magnification factor”. A lens with a 1:1 magnification factor produces a projected image on the sensor which is the same as the subject.
The individual pieces of glass that form the overall optical construction. Most lenses have between four and eleven elements to bend the light rays to ensure a perfectly formed image appears on the light sensitive surface, such as a film or CCD. The elements are arranged in groups and may be seen in specification sheets as, for example, 6 elements in 4 groups. That configuration may have two single elements and the other four grouped in pairs.