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Main
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Price
Advantages
PHOTOGRAPHY FEATURES Built-in flash: Yes
SCREEN / VIEWFINDER Screen size: 3.2″
SCREEN / VIEWFINDER Viewfinder type: Optical (pentaprism)
PHYSICAL Battery Life (CIPA): 1230
OTHER FEATURES GPS: Optional
Main
Model
Price
Advantages
SENSOR Effective pixels: 42 megapixels
SENSOR Max resolution: 7952 x 5304
SENSOR Sensor photo detectors: 44 megapixels
IMAGE ISO: Auto, 100-32000 (expands to 50-102400)
IMAGE Boosted ISO (maximum): 102400
IMAGE Image stabilization: Sensor-shift
PHOTOGRAPHY FEATURES Maximum shutter speed: 1/8000 sec
PHOTOGRAPHY FEATURES Continuous drive: 10.0 fps
SCREEN / VIEWFINDER Screen dots: 1,440,000
SCREEN / VIEWFINDER Touch screen: Yes
OPTICS & FOCUS Digital zoom: Yes
OPTICS & FOCUS Number of focus points: 425
PHYSICAL Weight (inc. batteries): 657 g (1.45 lb / 23.17 oz)
Summary
The Alpha a7R III highest resolution of 7952 x 5304 pixels (42 megapixels) is better than the Nikon D750 highest resolution of 6016 x 4016 pixels (24 megapixels). The Alpha a7R III has a wider ISO range of 100-32000 than 100-12800 ISO range of the Nikon D750. This ISO range allow you to make good quality photos in more difficult situations. The Alpha a7R III provides image stabilization which will allow you to make clearer images when using telephoto lenses. The Alpha a7R III offers more focus points than the Nikon D750: 425 vs 51. More number of focus points means more convenience when attempting to focus on objects which are not centred.
The Alpha a7R III screen is better as it has more screen dots 1,440,000 in comparison to 1,229,000 dots of the Nikon D750 display. The higher dot count screen is better for reviewing photos on your camera. The Nikon D750 is equipped with bigger size of the screen - 3 inches. The Alpha a7R III has a touch screen.
The Nikon D750 has built-in flash. The Nikon D750 battery life is better than the Alpha a7R III battery life. According to CIPA standards you will be able to make 1230 shots with the D750 and only 650 with the Alpha a7R III. The Alpha a7R III weighs 657g which is 93g lighter than the weight of the D750. The D750 can utilize optional accessory GPS devices. Recording GPS data can be useful for the travel photographer, to be able to go into the photo metadata and find out exactly where a picture was produced.
Taking into account the above-mentioned differences the Alpha a7R III is the best buy. Get the lowest price on Amazon