The Planar T lens, originally developed by Carl Zeiss, is one of the most successful camera lenses ever made, and the Contax 45mm f/2.0 G version lives up to expectations. This is a very fast lens and a high-performance option even in low-light situations. The large aperture delivers the best results when shooting without the best light sources. The lens design is a simple six-element optical formula in four groups, and the f/2.0 offers stunning natural perspectives as well. The focal length on this lens is 46.9 millimeters, with the closest focusing distance at 19.69 inches. The weight is just 6.71 ounces, and the autofocus lens works well with both single-lens reflex and digital single-lens reflex cameras - in still photography and video.