Huh? Read the link I just sent.
Chuck Norcutt
Ken Norton wrote:
> To the point, there is no difference between a point-source light and a lit
> object when we talk about light fall-off. Absolutely none.
>
> But we're confusing this thing called "illumination".
>
> Let's take a point-source of light: One Candle. This candle emits only so
> many photons. With distance, these photons spread out and in any one
> direction, (let's say one-millionth of an arc-second) there are very few
> photons. Let's assume that this one-millionth of an arc-second represents
> ONE PIXEL on a Canon 5D at a distance of 50 meters. If we move the camera
> closer to the candle, another pixel will fall into another millionth of an
> arc-second. The first pixel receives no additional photons, it's just that
> now we have two pixels getting light from the candle.
>
> Why is it that all pixels in the 5D aren't being illuminated at any
> distance? It would if you REMOVED THE LENS!!!!!. However, Thanks to the
> miracles of optics, the lens on your camera is forcing the direction of
> these photons to land on specific pixels only. The lens's front surface
> area represents the "illuminated surface" and is focusing all these captured
> photons on specific pixels.
>
> AG
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