I was just thinking about this, a 1.4x teleconverter loses 1 stop of light and zooms in at 1.4x. What about a .7X (1/1.4) teleconverter that would zoom OUT and gain you a stop of light? This would ONLY work using a film lens on a crop body as it would focus the full image circle smaller until it was the size of a DX lens image circle, but making it smaller would make it brighter. It would also give the same field of view then as they did on film. Just think, your common $500 80-200mm f/2.8 would be like a 57-142mm F/2.0! An 85mm 1.8 would be like a 60mm 1.2. A 50mm 1.4 would be a 35mm 1.0! Is this feasible? Why doesn't anybody make it? It would turn any mediocre film lens into a wider angle FAST lens. I know I for sure would love one if I could get it for $200 or so.