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)|
|ISO||Auto, 100-32000 (expands to 50-102400)|
|Lens mount||Sony E|
|Focal length mult.||1×|
|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″)|
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