The a7 III could detect human eyes, but only in a dedicated Eye AF mode that couldn't detect anything but eyes and faces. In terms of autofocus, the improvements over the a7 III should be fairly significant, not so much because of the promise to focus in conditions that are one stop darker (–4EV with an F2 lens) but because that camera was one of the last Sonys that didn't integrate Eye AF into its main AF system, and relied on a much more primitive AF tracking system.
60p footage has rolling shutter rate of around 12.8ms, which is low enough to avoid distortion of all but the fastest movement. It's likely the camera is dropping to 12-bit readout for video mode, like most ILCs, but the process of combining pixels when downsampling the 7K footage to 4K should reduce noise and hence prevent DR dropping to ~12EV.
Silent shutter mode is likely to result in significant distortion with moving subjectsįull-width 4K video takes around 26.5ms, which is comparable with the other models in its class. This means silent shutter mode is likely to result in significant distortion with moving subjects. 14-bit readout of the whole sensor for stills takes around 1/15 sec (~66ms), which is around seventeen times longer than the super-fast a1 takes to read out its sensor. Our first look at the rolling shutter rates suggest this isn't an especially fast sensor. Sony says the camera's buffer depth allows over 800 Raw+JPEG images (or over 1000 JPEGs), but this is in the uncompressed Raw format, which again shoots at around 6 fps. The a7 IV has a lossless compression option, for when you need maximum processing flexibility, but the burst rate drops to around 6 fps if you use it. However, it can only do so in the lossy compressed format if you want to shoot Raw. A slight uptick in detail and comparable low light performance is the most likely thing we can expect, in terms of image quality.ĭespite the higher resolution, the a7 IV can still shoot at 10 frames per second. Given that BSI sensors are already widely used in the current generation of cameras, we're not expecting huge leaps forward in image quality. This represents a move away from the 24MP chip used by the a7 III and its immediate Panasonic and Nikon rivals. What's new | How it compares | Body and controls | Initial impressions | SpecificationsĪt the heart of the a7 IV is a new 33MP BSI-CMOS sensor. The a7 IV will be available from late December 2021 at a recommended price of $2499, a $500 increase over the launch price of the a7 III. The a7 IV sees just about every one of its specifications improved over the a7 III, from basics such as the resolution of the sensor and viewfinder to significantly increased video capture options.
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