Hi, Just changed from Olympus OM-D to a Canon 7D with a Canon EF 17-40mm F/4.0 L USM. ( My first Canon )
I follow the British Super Bikes and other Motor Sport and have looked at the following.
Canon EF 70-200mm f/4.0 L IS USM
Canon EF 70-200mm f/2.8L IS USM
Canon EF 100-400mm f/4.5-5.6 L IS...
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