this post was submitted on 11 Feb 2026
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To add more specifics here for you, note that the f-stop is usually shown as a fraction, like f/2.8, f/4.0, etc.
So first of all, since the number is on the bottom of the fraction, there's where you get smaller numbers = more light.
It's also shown as a fraction because it's a ratio, between your lens's focal length (not focal distance to the subject) and the diameter of the aperture.
So if I'm taking a telephoto shot with my 70-200 @ 200 with the aperture wide open at f/2.8, that means the aperture should appear as 200/2.8 = 71.4mm. And that seems right to me! If you're the subject looking into the lens the opening looks huge.