If you liked your 300, you're going to want something closer to 500. If you like teleconverters, that's your thing.
The Canon 70-300, I dunno why people buy those. For a canon lens, it is really not that good. The Sigma and Tamron offerings in the same focal lengths are way better.
They don't call the 100-400 the "Dust Pump" for no reason. Luckily it doesn't seem to affect IQ until years down the line. also apparently its easy to clean.
anyway, when i shot at the track, I was shooting over 300mm equiv for like 90% of the shots
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