06-23-2016, 04:50 PM
stoppingdown, are you sure your Sigma has the latest firmware-update? There were at least two I'm aware of.
To me it appears you were shooting handheld. My in-focus rate with the 150-600 increased when using a tripod and I think, it's quite easy to send the focus unit to the wrong place when you consider all the delays in between. You move just a little bit and the contrast detection gets the wrong impression.
Also, are you using OS? Although I believe you already set it off - in case no, set it off as it's causing also a kind of moving error.
To me it appears you were shooting handheld. My in-focus rate with the 150-600 increased when using a tripod and I think, it's quite easy to send the focus unit to the wrong place when you consider all the delays in between. You move just a little bit and the contrast detection gets the wrong impression.
Also, are you using OS? Although I believe you already set it off - in case no, set it off as it's causing also a kind of moving error.