Have found this one problem with ONE of my lens. The Sigma 70-200M f2.8 HSM II, works with AF.S and AF.C. However using live view when I press the shutter button the focus never locks but oscillates backward and forward, from one end to the other. It does stop some times but at the nearest focus point. All the green focus points illuminate at the same time.
Edit. On further testing the oscillation goes from one end to the other twice and then stops. The number of green focus points depends upon the picture in view. Not supprisingly It also happens in movie mode, the AF oscillates when trying to get into focus before put into REC. Tried with my only other HSM lens 18-125mm no problems.
Last edited by fb_penpho; 06-20-2015 at 05:25 AM.
Reason: Further investigation