You do not understand f-stop part II

Started Jul 28, 2014 | Discussions thread
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You do not understand f-stop part II
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Just wanted to respond to this little bit dtmateojr said:

"Well here's the thing: I based facts on physical laws. It is a known fact for example that light intensity diminishes as the square of the distance. Other natural phenomena behave the same way such as gravitational force. In photography, this "distance" is your focal length."

I'm beginning to see where you've gone wrong.  The "distance" is not your focal length.  The distance is the distance to the light.  The inverse square law is about light spreading out.  Within your focal length, the light is being focused (i.e. not spread out).  A larger focal length needs an aperture not because of the distance, but because of the change in magnification/AoV.  The math works out the same, but you've got it backwards, really.

In other words, you do not understand the law you're basing your theories on.

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