well I went to try the lens and was very disapointed with the results... very soft amd with low contrast at f2.8 getting a bit better at f4 but even then it was nowhere near as good as the Canon 300 f4 at f4. Also it was interesting to see just how far short of 300mm the Sigma is. Attached are three 100% crops from my test shots, shame it wasn't a good copy or I'd have had it.
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