Sony a7R IIIA Overview
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The Sony a7R IIIA is a full-frame mirrorless camera that uses a 42.4MP stabilized BSI CMOS sensor. The Mark IIIA has numerous improvements over its predecessor, many of which are borrowed from the flagship a9. Faster processing and a redesigned shutter allow for 10 fps bursts (or 8 fps with no viewfinder blackout), and a refined autofocus system promises better subject tracking performance. The design hasn't changed much, with the main additions being a higher resolution EVF, joystick for adjusting the focus point, dual SD card slots and a higher capacity battery. Video can be captured at UHD 4K (30p) using the full-width of the sensor or a Super 35 crop, and 1080/120p option is also available. The a7R III supports S-Log3 and Hybrid Log Gamma profiles, among others.
The "A" variant is the same as the original a7R III, except for the higher-resolution (2.36M-dot) LCD.
| Body type | SLR-style mirrorless |
|---|---|
| Max resolution | 7952 x 5304 |
| Effective pixels | 42 megapixels |
| Sensor size | Full frame (35.9 x 24 mm) |
| Sensor type | BSI-CMOS |
| ISO | Auto, 100-32000 (expands to 50-102400) |
| Lens mount | Sony E |
| Focal length mult. | 1× |
| Articulated LCD | Tilting |
| Screen size | 3″ |
| Screen dots | 2,360,000 |
| Max shutter speed | 1/8000 sec |
| Format | MPEG-4, AVCHD, XAVC S |
| Storage types | Two SD/SDHC/SDXC slots (UHS-II support on one) |
| USB | USB 3.2 Gen 1 (5 GBit/sec) |
| Weight (inc. batteries) | 657 g (1.45 lb / 23.17 oz) |
| Dimensions | 127 x 96 x 74 mm (5 x 3.78 x 2.91″) |
| GPS | None |
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