In the mid 60’s, NASA commissioned Carl
Zeiss’s optical facility to develop a ‘super fast’ lens to use on the
Apollo missions. For those of you unfamiliar with this terminology, a
‘fast’ lens is one that lets in the most light possible with a wide open
aperture.
The lens would solve a very specific problem for NASA; its intended
purpose was to counteract the issue of having to take photos of the
incredibly dark shadow areas of the moon. It wasn’t as easy as just
putting a super high ASA/ISO (light sensitivity) film into the camera,
because without enough light passing through to the film, it would just
be super grainy blackness even with high sensitivity.
Zeiss went to extreme lengths to produce the specialised lens for NASA.
Zeiss were not unfamiliar with the idea of a lens like this, since 1874
the basic design of the lens (a double-gauss lens) existed. Zeiss
themselves began research and development on this type of lens long
before WWII but during, they created a lens similar to the one which
would be used by NASA for night time weapons guidance. But they
pulled all the stops for NASA (pardon the pun) and they created a lens
which would become one of the fastest lenses ever made - the Planar 50mm f0.7.
While just looking at the number f0.7 (a measurement of the amount of
light passing through the lens) might seem insignificant, to put it in
perspective; an f1.4 lens is considered to be a very ‘fast’ lens for
night time shooting, the Zeiss 50mm f0.7 lets in an incredible four
times the amount of light. Zeiss made 6 lenses for NASA for their
Apollo missions, they then made 4 more lenses, one for themself (which
can be seen in their museum) and 3 for one of the most prolific
filmmakers of the time - Stanley Kubrick.
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