This afternoon was spent at a local airshow and I brought my Sony A7iii and some lenses with me to capture the sights.  This was my first true test of the Sigma 100-400mm (Canon EF mount) telephoto lens attached to an MC-11 adapter and mounted on the A7iii.  I can say with certainty that it passed with flying colors.  Focus was very quick, the camera locked on and the focus box tracked the aircraft all through the frame.  I could have used some more reach, but it was my fault for not buying the 150-600mm instead…