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Main
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Advantages
SCREEN / VIEWFINDER Screen size: 3.2″
SCREEN / VIEWFINDER Screen dots: 2,359,000
SCREEN / VIEWFINDER Viewfinder type: Optical (pentaprism)
PHYSICAL Battery Life (CIPA): 1240
OTHER FEATURES GPS: Optional
Main
Model
Price
Advantages
SENSOR Effective pixels: 24 megapixels
SENSOR Max resolution: 6000 x 4000
SENSOR Sensor size: Full frame (35.6 x 23.8 mm)
SENSOR Sensor photo detectors: 28 megapixels
IMAGE ISO: Auto, ISO 100-51200 (expands to 50-204800)
IMAGE Boosted ISO (maximum): 204800
IMAGE Image stabilization: Sensor-shift
PHOTOGRAPHY FEATURES Continuous drive: 20.0 fps
OPTICS & FOCUS Number of focus points: 693
PHYSICAL Weight (inc. batteries): 673 g (1.48 lb / 23.74 oz)
Summary
The Alpha a9 highest resolution of 6000 x 4000 pixels (24 megapixels) is better in comparison with the Nikon D500 highest resolution of 5568 x 3712 pixels (21 megapixels). The Alpha a9 is equipped with larger sensor than the Nikon D500: Full frame (35.6 x 23.8 mm) versus APS-C (23.5 x 15.7 mm). This is very significant advantage of this model as big sensor lets the photographer to make pictures of the better quality. The Alpha a9 provides image stabilization which will allow the camera owner to make clearer pictures of non-moving subjects in low light when the camera owner is not using the flash. The Alpha a9 offers more focus points in compare with the Nikon D500: 693 vs 153. More focus points means more convenience when attempting to focus on objects which are not centred.
The Nikon D500 display is better as it has more screen dots 2,359,000 in comparison to 1,440,000 dots of the Alpha a9 screen. The higher dot count display is better for reviewing photos on your camera.
The Nikon D500 battery life is better in compare to the Alpha a9 battery life. In accordance with CIPA standards the camera owner will be able to produce 1240 photos with the D500 and only 650 with the Alpha a9. The Alpha a9 weighs 673g which is 187g less in comparison with the weight of the D500. The D500 can utilize optional accessory GPS devices. Recording GPS data can be useful if the camera owner is a traveller, to be able to go into the photo metadata and find out exactly where an image was captured.
The Sony Alpha a9 has 10 advantages and the Nikon D500 only 5 so the Alpha a9 is the best buy. Check the list of the best offers on Amazon