I'm a little confused. Am I reading that some lenses are for color, and others for B&W? I only ask because I have 8 lenses ranging from 780mm to 35 mm for enlarging. Most are Nikkor, but either way, I use all of them for color and b&w. I change mainly based on the size of the source image, with the 780mm being able to handle 30in diameter original, 485mm for roughly 18 in diagonal, etc.

I didn't think color or b&w had lenses specialized for each one.