For those who keep harping about lack of sharpness of cats, here is sample. 100% crop from a new FD 500mm f/8 mirror lens with FD 2X B TC attached and shot with an M6 II. That is 1000mm and a FF equivalent of 82 MP. Note the fine print at the bottom of the warning label. This was shot at around 70 yards distance. Also note that many scenes do not result in doughnut bokeh. The biggest issues with cats are nailing focus and stability, so in my view, a cat with IS and AF would be quite usable over a wide range of applications. The other issue with cats is that the airy disk has a hole in the middle, so the perceived depth of field is less than a refractor. That can be good or bad, depending on the scene, but if you understand it, you can work with it.
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