Im afraid any aperture increase will be a significant size and weight increase and im not sure Canon will do that. The main selling point of this lens is being a compact do-everything sports, wildlife and events. But full TC compatibility would be great.Optically the rf 100-500 is excellent. however using it with an extender is significantly annoying. It just won’t collapse completely. A mark II that fixed that would be a great feature. Reducing the f/7.1 at the high end would be better for low light, even if it added some size / weight. For example f/6.3 would increase the front element from the current 77mm to approximately 82mm. Not much of an improvement I know, but according to Tesco every little helps.
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