YashicaFX2 wrote in post #16414347
I have to ask what lens you had on the T2i that couldn't keep up? My T1i could easily handle something moving as slowly as a swimmer, in AI-Servo with decent glass. My 60D does a fine job of my dog coming straight at me on a dead run, with decent glass. And that dog is easily moving at 10 times the speed of the swimmer. I wouldn't expect an 18-55 or 18-135 to handle that so well. My 15-85 and Σ70-200 2.8 acquit themselves nicely. I am quite certain you don't need a 1D3 to get in-focus shots of something moving that slowly.
Same lens, same light, same day. 70-200 f/2.8L. I was able to get in focus on the T2i, just not consistently. The challenge is not the speed of the swimmer, but the small amount of time their face spends out of the water during the butterfly stroke. The T2i doesn't have the AF customization available to tell it to linger when the swimmer vanishes between strokes. Then, when the subject reappears, it has to try to recognize the focusable edges and start moving the lens, all while the processor is sharing the load with writing 18MP images at 3.4FPS as the buffer is dwindling.
1D3 lets me tell the AF system to cool its jets and wait for the subject to return, and it has a processor dedicated to this job.
Then take into account that I'm shooting 70 swimmers in 3 hours. With the T2i, to get enough keepers, I had to send kids through 2-3 times. With the 1D3, I only need 2-3 strokes to come out with 20 keepers. We're talking about 2x as many keepers in about 10% of the time.
Keep in mind that I'm shooting f/2.8 telephoto, giving me a very thin DoF. The T2i just can't handle it at a rate that will keep the customers rolling through.
If I take my absolute best T2i swimming photo, the IQ doesn't hold a candle to what my 1D3 can catch on accident. I shot with the T2i for 2.5 years, pushing it as far as I could as a sports body. I got great results (many kids have a large canvas over their bed from these shots), but it's a big challenge, and often frustrating. When it came time to upgrade, I knew exactly what I needed, and it came down to a close race between the 1D3 and the 7D.