Sun 17-Feb-13 05:41 AM | edited Sun 17-Feb-13 05:43 AM by torwood
I understood the original poster's question to be with regard to high ISO performance. In that area, the D7000 is a clear upgrade from the D300s. It is not, however, a direct replacement. Clearly, as I posted above, the D300s is superior in AF performance and ruggedness. Also, if you like the "pro" control layout, the D7000 doesn't have it. But, the trade-off is a smaller, lighter body, with a newer imaging processor and software. The external controls are adequate for the advanced amateur, if not in exactly the same place as they are on the pro bodies. If I'm not mistaken, other buttons can be programmed as "AF-On" in custom settings. I also have never experienced the problem of changing shooting modes because the dial doesn't lock. As ergonomics go, I am far more likely to bump the AM/M switch on my smaller lenses, and disengage AF for a few frames.
While I disagree with Eric: in practical shooting, the D7000 is at least 1.5 stops cleaner/more cropable than the D300s/D90 sensor, I do agree that the D600 would be an even bigger upgrade in high ISO performance, since it is superior to the D7000. For basketball, you can shoot with shorter focal lengths. I use three lenses for basketball: AFS 35 f1.8, AFS 50 f1.8, and AFS 85 f1.8. For FX, you could simply drop the 35mm from the kit, and the other two lenses would be fine. Even if you wanted to zoom, you could get by with the 24/28-70 f2.8, or the 70-200 f2.8. These are not inexpensive, but they are not as cost prohibitive for the amateur as the 300 and 400 f2.8 lenses needed to shoot outdoor field sports with FX. As such, I would also consider the D600 a viable upgrade for the amateur who wants to shoot his kids' basketball games.