Sony a7R IV vs Sony a7S III Specifications Comparison Camera Feature Sony a7R IV Sony a7S III Announced July 2019 July 2020 Camera Type Mirrorless Mirrorless Sensor Type BSI CMOS BSI CMOS Image Processor BIONZ X BIONZ XR Resolution 61.0 MP 12.1 MP Pixel Dimensions 9504×6336 4240×2832 Sensor Dimensions 35.7 x 23.8 mm (Full Frame) 35.6 x 23.8 mm (Full Frame) Sensor Pixel Size 3.8µ 8.4µ Low Feature lists. 24.2MP 2 35mm full-frame CMOS sensor with back-illuminated design. Sensitivity range up to ISO 51200 (expandable to ISO 50-204800 for stills) Fast Hybrid AF with 693 phase-detection and 425 contrast-detection AF points. High-speed continuous shooting of up to 10 fps 3 with AF/AE tracking. 4K HDR 4 5 movie recording capability. Pros 12MP full-frame sensor 4K recording at 10-bit quality 120fps slow motion at 4K Face and eye detection autofocus Subject tracking at 10fps High sensitivity for low light 5-axis IBIS Dust and If you shoot 1080p, the A7S III delivers the best HD quality of any Sony mirrorless camera, because it can supersample the entire sensor. It also supports 240 fps for super slow-mo effects. 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. The Canon EOS 1Ds Mark III receives a score of 60/100 for its optics. This camera features 21.1 megapixels, a shooting speed of 5, and a CMOS sensor. It uses a Digic III processor and has a DXOMARK sensor score of 80. The sensor size is full-frame, and the camera uses a Canon EF lens mount. Sony opted for a 24Mp sensor for the A7 III. On the basis of one of our recent Twitter polls, I think this a good decision. It gives a nice balance between file size and detail capture. It also maintains the separation between the A7 Mark III and the 42Mp A7R Mark III and 61Mp A7R IV. Although the A7 III's sensor is backside-illuminated (BSI Newly developed BIONZ XR image processing engine with up to 8x the processing performance 3. Movie-making with 4K 120p 4, 10-bit 4:2:2 recording capability. Fast Hybrid AF with 759 phase-detection AF points and enhanced Real-time Eye AF. Body-integrated 5-axis optical image stabilisation, Active Mode 5 6 for movies. Full specifications. r13tf.