Novice question - Aperture

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Satyaa Veteran Member • Posts: 4,486
Novice question - Aperture

I understand aperture f number and how it's used on my lenses for depth of field. I also know that each higher F number (one stop down) lets in half the light.

I don't know the optics technology behind this number. I don't mean the formula to get the number. I see that on Wikipedia. I mean in terms of actual amount of light that can be seen as a physical analogy.

I always thought that f/1.0 is the base. It means that the lens is able to see 100% of the available light. F/1.4 can only see half of it, and so on. Is this correct understanding?

In this situation what does an F number less than 1 mean? Do F/0.95 and F/0.7 let in more light than what's actually there? Does it work like sound amplification?

Thanks.

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