I'm not saying this will ever happen, but there are a lot of smart guys here who will know how to calculate this. I'm wondering what the size (front filter thread or front element?) of a 70-135 f/1.8, f/2 or 70-150mm might be, and whether or not it would be even practical from a size point of view. With what Canon has been producing lately, I am wondering whether there is a possibility that Canon would make a shorter zoom than a 70-200 f/2.8 with a wider aperture. For a guy that focuses almost exclusively on portraits, model boot camps, or fashion show runways, something faster and shorter would be really nice in a zoom, from my perspective.