Ive never used a Depth of Field scale. But I am reading about it right now. So I'm curious... On the lens, how do you know which aperture matches with which distance? Are the apertures matched to the appropriate distance by color? Maybe that sounds confusing.. I mean.. For example.. Let's say f/5.6 marking (on the lens) is PINK , and 7ft distance marking (on the lens) is also PINK, so they match. Is that how it is?