The Sony a7 outperforms the a7S in some areas. It has a higher megapixel count of 24 compared to the a7S's 12.2, enabling the a7 to capture more detailed images. The a7's sensor also has a higher DXOMARK score of 90, compared to the a7S's 87. This difference suggests that the a7 has better overall image quality. Sony A7S-series = Video. While the A7S, A7S II and A7S III are intended as the video cameras, Sony hasn't stinted on the video features of the A7R II, A7R III, A7R IV, A7R V and A7 III. However, where the A7S models win is with their low-light capability. They all have a native sensitivity that tops out at ISO 102,400. Sony A7S III (mark 3) Release date: October, 2020. On sale ($3500 / £3800 / €4200) The A7 III introduced a lot of specs that made the full frame E-mount series very appealing: a new sensor with better dynamic range and high ISO, an advanced autofocus system, 4K video, dual card slots, class-leading battery life, all at the right price. The Sony A7S III is the latest iteration of Sony's full-frame video and stills hybrid mirrorless cameras, based on the A7 series bodies and tech.As the most video-centric of the series, the camera features a new 12 MP BSI CMOS sensor that's optimized for 4K video, with a sensitivity from ISO 80 to 102,400, plus expansion to ISO 40-409,600.. Like others in the A7 series, it has built-in 2. ISO range. • Sony A7S III: ISO 80-409,600 (expanded) • Sony FX3: ISO 80-409,600 (expanded) • Sony FX6: ISO 320-409,600 (expanded), base ISO 800/12,800. All three cameras have the same maximum ISO in expanded mode, but the FX6 has a higher base ISO and dual native ISO technology with base ISO levels at ISO 12,800. • Sony A7S III: .64-inch OLED with 9,437,184-dot • Sony A7 III: 0.5-inch OLED with 2,359,296 dots. Amazingly, the A7S III has a higher-resolution viewfinder than the 61Mp Sony A7R IV, which seems a little odd when you consider that it can capture less detail. However, it's a nice problem to have and it provides a superb view of the scene. .

sony a7s mark iii specs