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AF hunting with Sigma 150-600mm f/5-6.3 DG HSM contemporary lens beyond 300mm
I have Sigma 150-600mm lens and I am facing issues with AF beyond 300mm. Earlier I used it with Canon 1100D and I assumed that this is due to f/5.6 limitation of 1100D.
Then I switched to Canon 90D which supports f/8 and lens’s f/6.3 aperture at 600mm is well within range.
However I am still facing the same issue.
I switched to back button focusing but it is still the same issue. I also did some changes with AF micro adjustments. Some how BBF works for larger subjects where i do AF-ON around 400mm and then zoom in to 600mm. But this is not happening every time. So I am struggling with AF with Sigma 150-600mm + Canon 90D combo.
On another note, lens works fine with manual focus on all ranges. I clicked some pics with MF and attaching herewith. But I want to know/Learn what I am missing for AF to work for me.
Please advise.
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