How fstop are calculated

Started Nov 28, 2011 | Discussions thread
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novetan Senior Member • Posts: 1,578
How fstop are calculated

I'm not a physicist but I'd have thought for lens fstop, the base is 1. We have Noctilux for Leica at f0.95, there are even f0.7, 50mm lens from Zeiss (Limited production lens built for the NASA space program) and f0.85, another Leica lens used on 35mm movie cameras by Stanley Kubrick for some candlelit scenes in Barry Lyndon.

All these figures no doubt don't help me to take better picture, but I'm curious to know how does the below 1 derived.

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Dave

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