On Sat, 12 Sep 1998 18:09:33 -0400, Dan wrote:

>Is it necessary to use both a polarizer and a red filter w/ black and
>whitw film? DO they do the same thing???

No, and no...
Most of the time, NO filter (other than a UV for protection...;-)
is just fine with B&W film. A medium yellow is often recommended,
but I find it a waste of good film speed under most conditions.
A red will very noticeably darken a clear blue sky. A polarizer
can noticeably darken a sky mostly around 90 degrees away from
the sun - but it will also alter reflections from other items
in the photograph. The two can be combined for maximum darkening
of the sky if conditions are right. With B&W infrared film,
a filter on the yellow-orange-red end is useful for cutting out
the other end of the spectrum to which IR film is also sensitive.