Spying with Telephoto Lenses Interested the CIA in the 1950s

Photographers today are very demanding. But in the 1950s, the CIA presented a plan for an even more demanding lens. Let's get one big fact out of the way first: telephoto lenses are large. If you look at the Sigma 200-500mm f2.8, then you'll know that this is true. However, the CIA didn't want big telephoto lenses. In fact, they wanted a lens that telescoped. What's more, they wanted at least f8 lenses. This isn't unreasonable if you consider the kinds of clandestine operations they did. Sometim...