I noticed there did appear to be two rings like the standard control ring, which is white on white lenses. But the texture of a white control ring is damn near useless for focusing. In fact, I have placed a 3M safety tread material on the focus ring of my 100-500 to make it more easily located and used. What I see from that quality photo of the 200-800 is either a push-pull design or something which will be near impossible to focus under intense conditions.
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