Autofocus system. The A7 III has 693 phase detection AF points covering 93% of the imaging area. This means that subjects can be followed across almost the entire frame. According to Sony, the faster readout speed of the A7 III's sensor helps give it faster focusing in low light than the Mark II. Sony claims it's around 2x faster. 127 facts in comparison. Sony A7 II vs Sony Alpha a7 III. Sony Alpha a7 III. Why is Sony A7 II better than Sony Alpha a7 III? 51g lighter? 599g vs 650g. 308.4k dots higher resolution (screen)? 1230k dots vs 921.6k dots. 19.64% less body volume? 725.02cm³ vs 902.21cm³. 14.3mm thinner? 59.7mm vs 74mm. Scroll down for more details. COMPARISON. Sony A7 III vs A7s II - The 10 Main Differences. Published on March 1, 2018. By Mathieu Gasquet. Last update: September 15, 2020. If you are interested in video, the choice from Sony can be quite overwhelming. Autofocus System. Sony says the AF system is derived from the one in the a9 and performs twice as fast as the one found in the a7 II. The a7 III features 693 phase-detection AF points that cover approximately 93% of image area (same as in the a9), plus 425 densely positioned contrast-detection AF points to improve focus. .

difference between sony a7 and a7ii