Here is an unimportant question that I have always wondered but never really asked. Why is apeture/f/stop measured the way it is? I mean the fastest lense I have is a f/2.8. I click it back once and get 3.2. then 3.5 then 4 then 4.5 etc. Starting at f/8, I then get whole numbers. Really the measuement of an f/stop boggles my mind. Why the decimals? It really isn't that important because I understand the practical aspects of f/stop settings, just not why it is numbered so.