Sony a9 vs Nikon D810

This is a full comparison between the cameras Sony a9 and Nikon D810. We compare them by looking at the categories you see below.

Sony a9

Nikon D810

Manufacturing

Sony a9 is manufacturered by Sony but Nikon D810 is from Nikon. Both Sony and Nikon are well known brands though.

Sony a9 were released 2017 and Nikon D810 was released 2014. That is a 3 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera	Released
Sony a9	2017
Nikon D810	2014

Type of camera

Sony a9 is a Mirrorless camera while Nikon D810 is a DSLR camera. More information about their differences will come soon.

Sensors / crop factor

Even though the camera sensors might be called differently they are both considered Full frame which means that the focal length of the lenses is not affected. There is no crop factor on any of these cameras and sensors.

Camera	Focal length, 50mm f/1.8 **
Sony a9	50 mm Full-frame sensor No crop factor/focal length multiplier
Nikon D810	50 mm Full-frame sensor No crop factor/focal length multiplier

** Experienced focal length when using a lens such as a common "50mm f/1.8"

Learn more about crop factor and focal length multiplier here:
Camera selection can affect the focal length (Sony)
Camera selection can affect the focal length (Nikon)

Resolution

Sony a9 has a 24 MP (Megapixels) resolution while Nikon D810 has 36 MP. If we break down this in more detail this is the data behind the numbers:

Camera	Megapixels
Sony a9	24 MP 24000000 pixels 6000 x 4000
Nikon D810	36 MP 36152320 pixels 7360 x 4912

Nikon D810 has a 51 % larger resolution than Sony a9. This could give you more details in the picture but also a possibility to crop more in the pictures, afterward while editing the pictures, if needed that is.

ISO range

Sony a9 has a larger ISO-range than Nikon D810. Sony a9 has an ISO range that stretches from 100 to 51200 while Nikon D810 has 64 to 12800.

Camera	ISO Range
Sony a9	100-51200
Nikon D810	64-12800

Autofocus and lens compatibility

Both of these cameras have a built-in autofocus motor. Some lenses, that support autofocus, do not have an autofocus motor of their own but this won't cause any problems with these two cameras.

Here is a complete overview of which lenses work with each camera:
Lens compatibility chart for Sony a9
Lens compatibility chart for Nikon D810

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Sony a9 can shoot up to 20 pictures per seconds and Nikon D810 can shoot up to 5 pictures per seconds.

Camera	FPS (Frames per second)
Sony a9	20
Nikon D810	5

Ability to record movies

It is becoming more and more popular to record movies with digital cameras.

In this case, both Sony a9 and Nikon D810 can shoot movies.

Weight

The weight of the camera can be an extremely important factor, especially if the camera is about to be used, or carried around, for several hours at a time.

Nikon D810 weighs 980 gr (equal to 2.16 lb) which is 46% heavier than Sony a9 and its 673 gr (or 1.48 lb).

Camera	Weight
Sony a9	673 gr 1.48 lb
Nikon D810	980 gr 2.16 lb