I'm about to take possession of a Bronica SQ-Ai camera that comes with the Bronica bellows lens hood. The hood accepts various vignetting masks on the front, and 3x3 gel filters on the rear, and I thought it would interesting to experiment with these features, but primarily with the gel filters. The filter frames are not hard to find, but alternatives to the LEE gels for B&W appear non-existent. Is this the case, or are there decent alternatives to LEE's offerings in 3x3, or better yet, large sheets?
Terry
Terry