The Recent F/stop Controversy

Started 1 month ago | Discussions thread
Great Bustard Forum Pro • Posts: 42,954
Re: The Recent F/stop Controversy
2

threw the lens wrote:

The f-stop is only slightly weird in that a smaller number lets in more light. Apart from that, I'm fine with it.

Consider a 100mm lens at f/2 and at f/4. What f/2 and f/4 literally mean is that the diameter of the aperture is 100mm / 2 = 50mm and 100mm / 4 = 25mm, respectively, since the "f" represents the focal length. The wider aperture (which, by the way, is why we say "f/2 is wider than f/4") lets in more light for a given scene and exposure time.

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tex
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