Semi hijacking this thread.

I got a b+w 099 filter coming in. It's orange in color. I have used orange filters and do routinely.

There are no posted filter factors for this filter at all. Anyone happen to know?

Id like to use it with regular panchromatic films (im guessing it will work just like an orange filter) as well as HIE.

Filter factors or ei ballpark would be nice, I'd rather not burn precious film bracketing or shooting an entire roll for tests.