I'm having trouble with this one as well.
In the studio, if I use a soft box, it's hardly a 'point source' but
its output is governed by the inverse square law (thank goodness, as
i have a couple of old non-adjustable heads).
Again, I have noticed that if i move the camera position well back
and nothing else, from an evenly lit subject such as a person against
a backdrop with a similar tone to skin, then there seems to be a drop
in the light reaching the camera.
This made sense to me - why should there be any difference in the
behavior of light emitted and light reflected? - photons are photons.
Never really bothered to check it - I just check the histogram every
time I change a set up significantly - but it seems to make sense.
But then of course, using an incident light meter makes nonsense of
all that too.
Bugger - I'm confused.
Andrew Fildes
afildes@xxxxxxxxxxxxx
On 05/01/2009, at 5:19 AM, WayneS wrote:
> The difference is not about the subject being the light source
> but rather the subject is illuminated, hence its intensity is what it
> is. Just because the photographer is further from the subject
> does not change its illumination.
--
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