Re: dark sky

[Joshua_Putnam <josh@xxxxxxxxxxxx>]

KUET EE FOO <kuetef@xxxxxxxxxxxxxx> writes:

>I have seen pictures of landscape which the sky is very dark. I took
>some shots which also included the blue sky, but the result is only dark
>grey.

>I like to know whether the dark sky is obtained by burning-in in the
>darkroom or there is something that I need to do when shooting.

A deeper filter will darken the sky more, but what looks like a
blue sky isn't always the sort of clear blue sky that will turn
really black.  You've probably noticed how bright clouds are in
IR photos.  A uniform high haze that makes the sky look like a
somewhat washed out blue will leave the sky quite light in IR,
sometimes no darker than you'll get with standard panchromatic
B&W and a deep red filter.  We get a lot of days like that in the
Seattle/Puget Sound region because of our relatively high
humidity.  All the other IR effects are there: the bays turn
black, the trees are light, etc., but the skies stay more normal
looking.

- -- 

 Josh@xxxxxxxxxxxx  is  Joshua Putnam / P.O. Box 13220 / Burton, WA 98013
                       "My other bike is a car."                   
                     http://www.wolfenet.com/~josh/
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