User:Mfield/zeiss 50mm 0.7 lens

The Zeiss 50mm f0.7 is an ultra fast lens developed by Carl Zeiss for NASA and used for filmmaking by Stanley Kubrick.

Background
Zeiss developed the lens for use by NASA in ultra low light environments. The maximum aperture of f0.7 is two stops wider than the f1.4 aperture of the fastest common standard 50mm lenses.

The amount of light captured by a lens is proportional to the area of the aperture, equal to:


 * $$\mathrm{Area} = \pi \left({f \over 2N}\right)^2$$

Where f is focal length and N is the f-number.