I'm looking for 40.5mm filters for B&W photography, e.g., yellow, deep yellow, orange, red, yellow green. Any good quality brands will do: Tiffen, Hoya, B+W, Heliopan.
I would like to use it on Pentax 17. Due to the small size of the camera, I don't feel it proper to use 52mm filters with step-up rings.
If no one offers some up here on the forum the go to guy for filters is Tim at filterfind.net. He has always had a great section, very reasonably priced as well. And he’s located in your neck of the woods too: Berkeley.
I have a Hoya UV(0) new in original packaging. And a B+W 040 (Orange) unused in is original plastic case but without the outer paper box. Send me a note if interested and we can work out pricing.