OK ALL YOU full frame camera fanatics

Started Nov 14, 2012 | Discussions thread
Jim Ford Senior Member • Posts: 1,229
Re: Answer for your "understanding"
2

Great Bustard wrote:

Let's talk about the aperture of the lens. The f-ratio is the relative aperture, and the entrance pupil is the virtual aperture. For example, a 50mm lens with a virtual aperture (entrance pupil) of 25mm will have a relative aperture (f-ratio) of 50mm / 25mm = f/2. A 100mm lens with the same virtual aperture (entrance pupil) of 25mm will have a relative aperture (f-ratio) of 100mm / 25mm = f/4.

So, please go on about how the "lens aperture is purely a physical property of the lens, and nothing else"

You've answered the question yourself, above! All I see are measurements relating to the physical properties of a lens.

Jim

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