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SENSOR Sensor size: Full frame (35.9 x 24 mm)
IMAGE ISO: Auto, 100-32000 (expands to 50-102400)
OPTICS & FOCUS Number of focus points: 425
PHYSICAL Weight (inc. batteries): 657 g (1.45 lb / 23.17 oz)
Main
Model
Price
Advantages
SENSOR Effective pixels: 46 megapixels
SENSOR Max resolution: 8256 x 5504
SENSOR Sensor photo detectors: 47 megapixels
IMAGE Boosted ISO (minimum): 32
IMAGE White balance presets: 14
SCREEN / VIEWFINDER Screen size: 3.2″
SCREEN / VIEWFINDER Screen dots: 2,359,000
SCREEN / VIEWFINDER Viewfinder type: Optical (pentaprism)
PHYSICAL Battery Life (CIPA): 1840
Summary
The D850 maximum resolution of 8256 x 5504 pixels (46 megapixels) is better than the Alpha a7R III maximum resolution of 7952 x 5304 pixels (42 megapixels). The Alpha a7R III has larger sensor than the D850: Full frame (35.9 x 24 mm) versus Full frame (35.9 x 23.9 mm). It is the most significant specification of this camera because big sensor lets the camera owner to make photos of the higher quality. The Alpha a7R III offers a wider ISO range of 100-32000 than 64-25600 ISO range of the D850. Such ISO numbers let the photographer to make good quality photos in dim light conditions. The D850 has more number of white balance presets - 14. It gives the camera owner more control over colour. The Alpha a7R III offers more focus points than the D850: 425 vs 151. More number of focus points means less risk of losing focus lock while tracking a moving object.
The D850 display is better as it offers more screen dots 2,359,000 in compare to 1,440,000 dots of the Alpha a7R III display. The higher dot count display is better for reviewing photos on your camera.
The D850 battery life is better than the Alpha a7R III battery life. According to CIPA standards you will be able to take 1840 photos with the D850 and only 650 with the Alpha a7R III. The Sony Alpha a7R III weighs 657g that is 348g less than the weight of the Nikon D850.
The Nikon D850 has 9 advantages and the Alpha a7R III only 4 so the D850 will become the best buy. Get the list of the best offers on Amazon