If sunlight (skylight) were not
polarized, then polarizing filters would
have no effect and would not improve
your nice cloudy skies. The highest
percentage of polarized light from the
sky is to be found at about 90 degrees
to the sun's direction. To get the best
effect, have the sun to the right or
left of you when you start rotating your
filter to get that nice dark blue.
Sunlight that is reflected from a water,
or metallic or glass surface is further
polarized so that a polarizing filter
will (almost) completely eliminate the
reflection.
Don
[EMAIL PROTECTED] wrote:
No, sunlight is unpolarized, but as such it contains all polarizations and you
can extract anyone you want.
The reason why you can see the effect in some windows (and ice and a lot of
transparent hard plastic) is that the material acts as a polarizor. So if you
have the window of a polarizing material and you add another polarizer you can
get the effect. The reason why you get the colours is that the polarization is
wavelength dependent.
DagT
fra: Don Williams <[EMAIL PROTECTED]>
Sunlight is partially plane polarized.
Don
Peter Lacus wrote:
Hi Jostein,
To see the motif in the viewfinder just pop out as I turned the
polariser was an amazing experience.
Large version: 1000x668 pixels, 315 Kb
http://www.oksne.net/paw/sprekk1000.html
very nice, one time I did some shooting through the window of the
airplane and I've got similar rainbow effects. I still don't understand
how it works, though...
Bedo.
--
Dr E D F Williams
_______________________________
http://personal.inet.fi/cool/don.williams
See feature: The Cement Company from Hell
Updated: Print Gallery -- 16 11 2005
