I'm just curious. I haven't even seen my first negative off of my CV lenses yet. I am still really just a newbie. I have Plus-X in my Bessa-R now and have some rolls of Tri-X as well. I appreciate the advice and NOT having to buy a filter is a good thing. Imagine that, something I don't have to buy!
I would just like to try one of those 'dramtic' cloud photographs one of these days. Perhaps a red filter would be better for that.
I also saw a red, yellow, and green filter set from Kodak at the local thrift store that might fit onto my Voigtlander Vito CD that I could play around with as well.