Canon EOS 5D Mark IV vs Canon EOS 1Ds Mark III

This is a full comparison between the cameras Canon EOS 5D Mark IV and Canon EOS 1Ds Mark III. We compare them by looking at the categories you see below.

Manufacturing

These cameras are both manufactured by Canon.

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 "FF") 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 (Canon)

Resolution

Canon EOS 5D Mark IV has a 30 MP (Megapixels) resolution while Canon EOS 1Ds Mark III has 21,1 MP. If we break down this in more detail this is the data behind the numbers:

Canon EOS 5D Mark IV has a 43 % larger resolution than Canon EOS 1Ds Mark III. 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

Canon EOS 5D Mark IV has a larger ISO-range than Canon EOS 1Ds Mark III. Canon EOS 5D Mark IV has an ISO range that stretches from 50 to 102400 while Canon EOS 1Ds Mark III has 50 to 3200.

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 Canon EOS 5D Mark IV
Lens compatibility chart for Canon EOS 1Ds Mark III

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Canon EOS 5D Mark IV can shoot up to 7 pictures per seconds and Canon EOS 1Ds Mark III can shoot up to 5 pictures per seconds.

Ability to record movies

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

When comparing these two cameras there is only one of them that can shoot movies and that is Canon EOS 5D Mark IV. Unfortunately Canon EOS 1Ds Mark III does not support recording movies and movie clips.

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.

Canon EOS 1Ds Mark III weighs 1385 gr (equal to 3,05 lb) which is 56% heavier than Canon EOS 5D Mark IV and its 890 gr (or 1,96 lb).