On Sun, 01 Sep 2002 20:00:20 -0500, "John A. Lind"
<jlind@xxxxxxxxxxxx> wrote:
>
>
>1. The "tissue" is not a "myth." I've used it with decent effectiveness,
>albeit quite a number of years ago using a white cotton handkerchief. More
>recently I've used the same technique with the 21mm/ND2 white diffusion
>panel on a T-32. It has limitations and doesn't work under all
>conditions. Using a flat diffusion or ultra-wide angle panel over the
>front of a flash head works best with greatest effect in small spaces such
>as those found in the average home if it has white, or very nearly white,
>ceilings and walls. It does not work well in large, cavernous spaces or
>areas with dark walls such as wood paneling.
Quite correct - I think we are both on the same course but I didn't
express it very well! Indeed the tissue/hanky works because it
creates an almost hemispherical light flux pattern from the gun,
thereby allowing bounce from surfaces that would not otherwise be
"lit". If we're in a "free field" environment, it doesn't work.
>2. You are quite correct that focal length does not affect perspective,
>but you've left out the most important part of managing perspective *using*
>focal length. Perspective management is a combination of focal length and
>camera position relative to the principal subject. After a decision about
>principle subject magnification on the film is made, its perspective is
>managed by changing focal length *and* moving camera position
>proportionately to maintain the same principle subject magnification.
Agreed entirely. What one often reads in magazines, though, is the
statement that "using a telephoto compresses perspective" or whatever.
A fundamentally incorrect statement!
Regards
John Gruffydd (Mold, Wales, UK)
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