I lost 7 stops with the B+W 403 filter, so even with a 750ws flash only 60cm away, I was getting f4 with Plus-X pushed to 400ISO. I do like the sort of tintype effect this terribly unflattering filter gives.
I think it's very beautiful (though I guess most female models would disagree?)
Really love this dark look! -so intense...
Do you have this filter with a Rollei bayonet mount?