Drilling even deeper into my naivete...
Some of you rattle off groups of elements like I can rattle off films and papers. Howcome? If we're standing together at the Yosemite Tunnel View with half a dozen other Ansel Alikes, and you know how many elements and in what groups my lenses are made up of, what is it that you can tell me about my lenses or how they will see?
The question sounds a little sarcastic...I don't mean it to. I am eager to understand, and am trying to be entertaining in my approach.