[LargeFormat] polarizer compensation

[Brock Nanson]

Here's a quick one that will undoubtedly bring a variety of responses!!
What do people use for a typical exposure compensation for a Polarizing
filter?  I've seen 1.5 to 2 and a bit stops... I've always gone with 2 but
wonder if 1.5 might brighten the shadow somewhat, without lightening the sky
too much.  Is there a difference between circular and linear w.r.t. neutral
density?

While we're on the subject, what about a typical red filter for black and
white?  A 25 I think it is (?).

Brock