Re: more ir now?

[Jaap Los <imagefotografie@xxxxxx>]

p geller wrote:
> 
> Up here in the North Latitudes the amount of
> daylight has decreased and the sun rises
> less high in the sky.
> It occured to me that the color temperature
> would now be generally lower than during the
> other seasons. A check with a color meter
> confirmed my  suspicion.
> 
> 5090 K  today Dec 19 at noon on a bright but overcast day.
> 
> the following were made throughout the day on  December /1/98
> 
> 10:05 AM
> 4950 K
> sky clear blue& sunny
> 
> 11:41 AM
> 5000 K
> 
> 1:20 pm
> sunny
> 4940K
> 
> 2:30 pm
> wispy clouds+sunny
> 4730 K
> 
> 4:06 PM
> 3670 K
> 
> My question is : Has anyone noticed that there is a correlation between
> the decrease in color temperature and an increase in the amount of IR
> during the
> winter months. It it noticeable  as an increase in highlight density in
> exposed film.
> 
> Phil
> 
> ___________________________________________________________________
Phil,
I'm not surprised at all. You only have to look at the sun and notice,
that during wintertime the sun doesn't climb high and looks therefore
more orange. It is the same effect you see during summertime a few hours
before sunset. The color temperature of a tungsten bulb is very low, but
the amount of IR is very high, so high that you don't even need a
filter!
Best regards,
Jaap Los
Alkmaar, The Netherlands

See also my Infrared Photography Homepage specially made for you with
lots of information and links to other sites.
at:   http://home.wxs.nl/~losjb/


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