| Specifications | Sony a9 | Sony a9 II | 
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| Sensor: | 24.2-megapixel9 35 mm full-frame stacked CMOS sensor | 24.2-megapixel9 35 mm full-frame stacked CMOS sensor | 
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| Processor: | BIONZ X | BIONZ X | 
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| ISO Sensitivity Electronic Shutter: | ISO 100-25600, Expanded ISO 50 to ISO 25600 | ISO 100-25600, Expanded ISO 50 to ISO 25600 | 
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| ISO Sensitivity Mechanical Shutter: | ISO 100-51200, Expanded ISO 50 to ISO 204800 | ISO 100-51200, Expanded ISO 50 to ISO 204800 | 
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| Continuous Shooting Electronic Shutter: | 20fps with AF/AE tracking | 20fps with AF/AE tracking | 
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| Continuous Shooting Mechanical Shutter: | 5 FPS | 10 FPS | 
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| Autofocus Points: | 693 phase and 425 contrast detection points | 693 phase and 425 contrast detection points | 
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| Stabilization: | 5-axis (5.0-stops) | 5-axis (5.5-stops) | 
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| EVF: | 3.6 million dots | 3.6 million dots | 
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| LCD: | 1.4 million dots | 1.4 million dots | 
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| Image Buffer: | 362 JPEG, 241 RAW, 222 RAW+JPEG, 118 RAW (Uncompressed) | 361 JPEG, 239 RAW, 226 RAW+JPEG, 131 RAW (Uncompressed) | 
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| Electronic Shutter: | 1/32000 to 1/8 sec | 1/32000 to 1/8 sec | 
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| Mechanical Shutter: | 1/8000 to 30 sec | 1/8000 to 30 sec | 
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| Memory Card Slots: | Two Slots. Slot 1 (UHS II/I), Slot 2 (UHS I) | Two Slots. Slot 1 (UHS II/I), Slot 2 (UHS II/I) | 
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| Wireless LAN (Built-In): | IEEE 802.11b/g/n (2.4GHz band) | IEEE 802.11a/b/g/n/ac (2.4GHz band/5GHz band) | 
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| LAN Terminal: | 100BASE-TX (100Mbps) | 1000BASE-T (1000Mbps) | 
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| USB: | USB 2.0 | USB 3.2 Gen 1. | 
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| Dimensions (W X H X D): | Approx. 126.9mm x 95.6mm x 63.0mm | Approx. 128.9mm x 96.4mm x 77.5mm | 
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| Weight: | 588g (1lb 4.7 oz) | 678g (1lb 8.0 oz) | 
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| Battery Life Stills: | Approx. 480 shots (Viewfinder) / approx. 650 shots (LCD monitor) | Approx. 500 shots (Viewfinder) / approx. 690 shots (LCD monitor) | 
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| Price (MRRP): | $3,498.00 / £3,399.00 | $4,500.00 / £4,800.00 | 
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