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- Martin
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How to you find the difference in IQ and AF speed between the two lenses?
There is a lot of difference with AF with the Sigma being a lot slower and searching more even when restricted on distance. This was very noticeable on small fast birds like Hobby's and Swifts this weekend especially with busy backgrounds as I did not get one shot and started to wish I had taken the 500mm out as it has performed well so far.
As for IQ I have seen and taken some pretty sharp images with the Sigma hence getting another one but again the Canon does beat it by a fair bit if you really start zooming in, which is only to be expected It is a prime lens costing quite a considerable amount more even when bought second hand. Pitch any prime lens against the Sigma and they will more likely win. My 300mmf4 is sharper even with a 1.4TC on in my opinion.
The Sigma C has very decent IQ and wins on focal lengths, weight and size by a fair bit and the image OS is probably better than the mark one version of the 500mmf4 but then I rarely use it.
They are two different tools.