On Sat, 10 Feb 2001 at 18:47:50 +0000, Clive Williams
<[EMAIL PROTECTED]> wrote:
> What I don't understand, Inspector, is how a 71mm-wide disc of light
> can pass through a 50mm-wide hole.
To give you a *very* simple example, do the thought-experiment
punching a hole in the back of your camera. See that 60 story office
building over there? Its image will go through that hole (with the
right lens, of course!)
Thus it is no trick to getting an image of that 71mm diameter front
to squeeze through the throat at the back.
QED (maybe -- I may have committed a logical fallacy somewhere and
cooked up an example that demonstrates some other principle
entirely.)
--
Rodger Whitlock
Victoria, British Columbia, Canada
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