IR in summer vs. winter: (was Re: Presentation)

[Marco Pauck <pauck@xxxxxx>]

Russell Rosener wrote:
> 
> >Why is lower then summer the film ISO in winter?
> >And about focus, if I choose f/8 or smaller, that means focus increase
> >togheter the depth of field, but, how can I know if the focus is exactly?
[...]
> There is stronger IR light during the summer, simply because of the
> fact that you are closer to the light source-the sun.

Oops!
The phenomenon of summer is *not* caused by a decreasing
distance to the sun but a growing angle of incidence (i.e.
the sun rising higher) of course!  ;-)

	Marco
--
Marco Pauck -- marco@xxxxxxxx -- http://www.pauck.de/marco/
For every complex problem, there is a solution that is simple,
neat, and wrong.  -- H. L. Mencken
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