On Fri, 09 Aug 2002 19:02:31 GMT, "jriegle" wrote:

>I bought an orange filter O2 to darken the sky for some black and white
>shooting . A yellow filter wasn't enough and red is supposed to make the sky
>go almost black so I thought orange would be perfect.. In all my shots I
>found the sky to be fairly light. It was dry with little haze in the sky so
>I'm surprised the sky came out so light. I was using T-max 100 film. All my
>shots (various landscape subjects) are about same. Inspecting the negs shows
>the sky did get much exposure. Here is one example:
>http://home.att.net/~jriegle/badlands1.jpg
>
>I'll try a red filter the next time.
>Thanks, John

I could not get to the jpg, but, as with no filter,
the sky tone varies considerably with sun angle, with
the darkest sky in the photograph occurring in late
afternoon with full sun on the land (to raise its
relative values), with a very clear sky (the kind that
is blue to the ground on all sides and is blue around
your thumb held between you and the sun), and with
shooting 180 degrees away from the sun. Reverse much
of the above, and even a red filter will not do much...
An orange will give a light to medium grey tone much
of the time, more effective than the almost no effect
a medium yellow will show, but less exaggerated than
the medium to darkish grey of the red... For nearly
black skies, increase film contrast, shoot in optimum
conditions, and possibly add a polarizer.