Sigma 500 f4 Sport. Erratic AF. Corrections?

Started Feb 15, 2019 | Discussions thread
ManosSKG New Member • Posts: 17
Re: Sigma 500 f4 Sport. Erratic AF. Corrections?

Precise calibration is important. I never used a Sigma that doesn't need fiddling, some more than others. My copy was severely focus shifting (only 1 in 3 shots sharp) and I brought the lens to a fine balance throughout the range with more than 90% keeper rate (ie at par with OEM glass). I find calibrating using visual aids, not adequate though (ie sloped rulers etc). I use my in camera auto FT system in combination with the dock. I change my figures in the dock and use the auto FT system as a reference point until I get a 0 to 1-+ value. Steve Perry's target works fine.

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Nikon D500 Sigma 150-600mm F5-6.3 | C Sigma 500mm F4 Sport
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