I've been shooting some kid's indoor basketball games recently with my 5D classic and 85mm f/1.8, but this weekend decided to try my 40D again. Last spring I tried both bodies when shooting indoor soccer and liked the results from the 5D more than the 40D, mostly due to bad noise with the 40D at high ISO. However, I was really surprised this weekend when I tried the 40D again. The first surprise was how mis-focused most of the shots were and the second surprise was how the 40D at ISO1600 wasn't as noisy as I remembered. I think that's because I had to shoot at ISO3200 f/2 and 1/500 for indoor soccer and the 5D was clearly better than the 40D at ISO3200. For indoor basketball, I'm able to shoot at ISO1600 f/2 and 1/500, so the noise is not as bad.
So this leads to a couple questions. Does anyone think the EF 50mm f/1.4 is any good for sports photography in AI Servo mode? In many of my shots it seems the auto focus locked on things in the background instead of the players on the court. It's probably my lack of skill and experience, but I had much better results the previous week with my 5D+85mm. I know the 50mm f/1.4 isn't a true USM design, but that doesn't explain why it seemed to lock onto objects in the background.
Some examples where the focus is on the background (all shot with center AF point):
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For comparison, here are two similar shots from the previous week using the 5D+85mm:
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Any ideas or techniques to achieve correct focus in these types of conditions? I'm a bit surprised that the 40D+50mm seems so much worse than the 5D+85mm. I will try some different lens combinations on the 40D to see if it helps.



