I have a Beseler 23C enlarger with Dual Dichro colorhead. I haven't used it because I have no negative carriers for it. I'm debating making it replace my beloved Omega 6x6 condenser enlarger because it does larger formats, which isn't important right now but I want to get rid of one of the two for space reasons. But I can't try it out without spending money on negative carriers only to test it out, so I have some questions. First of all, I have Illford under-lens contrast filters that I now use. If you have ever used a Dichro head to print B&W, do you find it a great advantage over using gel filters? How do you arrive at filtration values for the different grades; use the paper manufacturer's suggested values? Is the exhaust fan in the color head noisy or cause vibration? It seems very iffy to me from a vibration standpoint, to have a fan in the enlarger head. Second, I guess this 23C can be set up as either a diffusion or a condenser enlarger, and that either one can be used for B&W but only diffusion can be used for color (I guess; I don't do color). In order to convert the enlarger to condenser mode, I need to install the "conic light integrator" which I have. Do I need any other parts? Is it worth converting to condenser mode if I plan on printing only B&W? Second, I have a 2" slide negative carrier. I could use this as a 35mm negative carrier by just stretching the film across the 2" opening. Does this sound like something that might work?