> In terms of most pro level sports, we have LONG since passed the time when ISO performance was the major issue. ... at the pro level, the lighting requirements have to be suitable for TV.
Well, some sports, and some pros. If you're shooting MLB or NASCAR, yes I totally agree. I can shoot those at night with a D3 even with a slow lens. But not everybody has big-time TV, or big-time TV lights, and some pros have to go there and shoot. Minor league baseball for example has two to three stops less light than MLB, and if you draw that assignment you're pretty desperate for f/2.8 glass at ISO 6400, and 12800 would be better. NASCAR feeder series tracks have a similar relationship to the big time, although I think the back side of the tracks are dimmer for both NASCAR and (say) Supermodified, making them even more difficult.
_____ Brian... a bicoastal Nikonian and Team Member
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