Lens testing

Have you ever wondered if the lens that you are thinking about buying is going to be any better than the one that you have in terms of center sharpness (assuming your body and lens like each other perfectly), check this out. So if I’m thinking that the 70-300 USM IS might be the lens that I want, but that the 70-200 f/4 L IS is the “also considered”, this will help to suitably confuse the situation.