On 6 December 2010 06:32, Larry Colen <[email protected]> wrote:
> I just got home from the dance event I was photographing this weekend. It
> was an awful lot like work, except for the bit about the paycheck.
>
> One of my challenges photographing the dance competitions was the aspect
> ratio of the room. Unfortunately it wasn't at the venue with the wonderfully
> handy mezzanine. The lights were about 10' high, and I'll guess that the room
> was about 40' wide. Combining the inverse square law and the pythagorean
> theorem that means that light falls off at the ratio of
> 1/(height^2 + distance^2)
>
> If we take the intensity at the base of the lamps as 1, this gives us roughly:
>
> 00' = 1
> 10' = 1/2 1 stop
> 14 ' = 1/3
> 17' = 1/4 2 stop
> 20' = 1/5
> 27' = 1/8 3 stop
> 30' = 1/9
> 40' = 1/17 4 stop
>
> My first thought was that I needed a graduated neutral density filter for my
> strobe to even out the light across the room, so that I wasn't running up
> against blowing out objects in the foreground, while objects in the distance
> faded to black. But, that would waste a lot of photons. What I really want is
> a graduated fresnel lens that would redirect light that would otherwise
> overexpose near objects, onto otherwise underexposed objects in the distance.
>
> It's my hope and guess that inferior quality of the optics would blur the
> beam enough that there wouldn't be a bunch of sharply defined bands of light
> and dark.
>
> Does this device already exist? If so, where could I get one?
Dude, quit reading Dilbert and start reading McNally--you need more lights!
Seriously, you do :-)
—M.
\/\/o/\/\ --> http://WorldOfMiserere.com
http://EnticingTheLight.com
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