panning
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Auto-focus performance/panning test: RF100-500 vs EF 300/2.8 II vs EF200-400
First off, this isn't a fully objective test (and I'm not sure you can create one without a very sizeable budget), but I found the data interesting enough to share and to hear if others had tested the lenses. I shoot a lot of motorcycle racing, and with picking up the RF100-500 about a month...