Which camera is for your? Here is a quick overview and spec comparison of the Sony a7R III and the Olympus OM-D E-M1X.
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| Sony a7R III | Olympus E-M1X | |
| Announced | Oct 25, 2017 | Jan 24, 2019 |
| Price * as of Jan 2019 | $3,199 USD | $2,999 USD |
| Body Type | SLR Mirrorless | SLR Mirrorless |
| Sensor Type | Full Frame Exmor RS CMOS (35.9 x 24.0 mm) | Four Thirds Live MOS (17.4 x 13.0 mm) |
| Image Size (Pixels) | 7,952 x 5,304 | 5,184 x 3,888 |
| Effective Pixels | 42.4 megapixels | 20.4 megapixels |
| Image Stabilization | 5-axis image stabilization | 5-axis image stabilization |
| Lens Mount | E-mount | Micro Four Thirds |
| Focal Length Multiplier | x 1.0 | x 2.0 |
| ISO | 100 – 32,000 | 200 – 25,600 |
| File Format | JPEG RAW (14-bit) | JPEG RAW (12-bit) |
| Number of Focus Points | 399 | 121 |
| Screen Type | 3″ TFT Tilt Screen | 3″ TFT Vari-Angle Monitor |
| Touch Screen | Yes | Yes |
| Monitor Resolution (Dot) | 1,440,000 | 1,037,000 |
| Viewfinder Type | Electric | Electric |
| Viewfinder Resolution (Dot) | 3,686,400 | 2,360,000 |
| Shutter Speed | 1/8,000 sec to 30 sec | 1/32,000 sec to 60 sec |
| Continuous Shooting | 10 fps | 60 fps |
| Silent Shutter | Yes | Yes |
| Built-in Flash | No | No |
| Video Resolution | 4K: 3,840 x 2,160 (24/30p 100M) FHD: 1,920 x 1,080 (120p 100M) | C4K: 4,096 x 2,160 (24p 237M) 4K: 3,840 x 2,160 (24/25/30p 102M) FHD: 1,920 x 1,80 (24/25/30p 202M) |
| Audio In (Microphone) | Yes | Yes |
| Audio Out (Headphone) | Yes | Yes |
| Media Slot | Dual SD/SDHC/SDXC Cards | Dual SD/SDHC/SDXC Cards |
| Battery Type | NP-FZ100 | BLH-1 |
| Battery Life (Still Images) | 530 shots (viewfinder) 650 shots (LCD monitor) | 870 shots 2,580 shots (Using quick mode) |
| Battery Life (Movies) | 100 min (viewfinder) 115 min (LCD monitor) | 170 min 350 min (When zoom and other operational functions are not used) |
| USB Charging | Yes | Yes |
| Dimensions | W = 126.9 mm H = 95.6 mm D = 73.7 mm | W = 144.4 mm H = 146.8 mm D = 75.4 mm |
| Weight | 572 g (body only) 657 g (with battery & memory card) | 849 g (body only) 997 g (with 2 batteries & 2 memory cards) |
| Timelapse Recording | Yes (with the future firmware update) | Yes |
| Other Features | Pixel Shift Multi shooting, Realtime Eye AF & Animal Eye AF (Future Update) | IPX1 Weatherproof, Tripod High Res Shot, Handheld High Res Shot, Live ND |