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Price
Advantages
SENSOR Effective pixels: 42 megapixels
SENSOR Max resolution: 7952 x 5304
SENSOR Sensor photo detectors: 44 megapixels
IMAGE ISO: Auto, 100-25600 (expands to 50-102400)
IMAGE Boosted ISO (maximum): 102400
IMAGE Image stabilization: Sensor-shift
PHOTOGRAPHY FEATURES Subject / scene modes: Yes
SCREEN / VIEWFINDER Articulated LCD: Tilting
VIDEOGRAPHY FEATURES Resolutions: 3840 x 2160 (30p, 25p, 24p), 1920 x 1080 (60p, 60i, 24p), 1440 x 1080 (30p), 640 x 480 (30p)
OPTICS & FOCUS Number of focus points: 399
PHYSICAL Weight (inc. batteries): 625 g (1.38 lb / 22.05 oz)
CONNECTIVITY Wireless: Built-In
Main
Model
Price
Advantages
PHOTOGRAPHY FEATURES Built-in flash: Yes
SCREEN / VIEWFINDER Screen size: 3.2″
SCREEN / VIEWFINDER Screen dots: 1,229,000
SCREEN / VIEWFINDER Viewfinder type: Optical (tunnel)
PHYSICAL Battery Life (CIPA): 1200
OTHER FEATURES GPS: Optional
Summary
The Alpha 7R II highest resolution of 7952 x 5304 pixels (42 megapixels) is better in comparison with the Nikon D810 highest resolution of 7360 x 4912 pixels (36 megapixels). The Alpha 7R II has a wider ISO range of 100-25600 than 64-12800 ISO range of the Nikon D810. This ISO range let the camera owner to capture good quality pictures in more difficult situations. The Alpha 7R II has image stabilization that will allow the camera owner to capture sharp images when he or she has naturally shaky hands. The Alpha 7R II has more number of focus points than the Nikon D810: 399 vs 51. More number of focus points means less risk of losing focus lock while tracking a moving object.
The Alpha 7R II has tilting LCD that will let the camera owner to shoot amazing selfies. The Nikon D810 screen is better as it has more number of screen dots 1,229,000 in compare to 1,228,800 dots of the Alpha 7R II screen. The higher dot count screen is better for reviewing images on your camera.
The Nikon D810 is equipped with built-in flash. The Alpha 7R II is equipped with built-in Wi-Fi that will help you to transfer pictures wirelessly from a digital camera to a PC. The Nikon D810 battery life is better than the Alpha 7R II battery life. According to CIPA standards the camera owner will be able to make 1200 photos with the D810 and only 290 with the Alpha 7R II. The Alpha 7R II weighs 625g that is 355g lighter in comparison with the weight of the D810. The D810 can utilize optional accessory GPS devices. Recording GPS data can be convenient if the camera owner is a traveller, to be able to go into the photo metadata and see exactly where an image was shot.
Considering the above-mentioned differences the Alpha 7R II becomes the best choice. Check the list of the best offers on Amazon