Nikon D810 vs Nikon D3s

This is a full comparison between the cameras Nikon D810 and Nikon D3s. We compare them by looking at the categories you see below.

Manufacturing

These cameras are both manufactured by Nikon.

Type of camera

Both these cameras are DSLR cameras. No difference there.

Sensors / crop factor

Both these cameras have the same sorts of sensor (called "FX") which means that if you compare these cameras side by side the lenses will also have the same experienced focal length. Since both cameras have a Full frame sensor there will be no crop factor.

** 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 (Nikon)

Resolution

Nikon D810 has a 36 MP (Megapixels) resolution while Nikon D3s has 12,1 MP. If we break down this in more detail this is the data behind the numbers:

Nikon D810 has a 200 % larger resolution than Nikon D3s. 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

Nikon D3s has a larger ISO-range than Nikon D810. Nikon D3s has an ISO range that stretches from 200 to 102400 while Nikon D810 has 64 to 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 Nikon D810
Lens compatibility chart for Nikon D3s

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Nikon D810 can shoot up to 5 pictures per seconds and Nikon D3s can shoot up to 9-11 pictures per seconds.

Ability to record movies

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

It is only one of these two cameras that support recording movies and movie clips and that is Nikon D3s. Sadly, the Nikon D810 does not support this.

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 D3s weighs 1240 gr (equal to 2,73 lb) which is 27% heavier than Nikon D810 and its 980 gr (or 2,16 lb).