Canon EOS 1D Mark III vs Canon EOS 850D

This is a full comparison between the cameras Canon EOS 1D Mark III and Canon EOS 850D. We compare them by looking at the categories you see below.

Canon EOS 1D Mark III

Canon EOS 850D

Manufacturing

These cameras are both manufactured by Canon.

Canon EOS 1D Mark III were released 2007 and Canon EOS 850D was released 2020. That is a 13 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera	Released
Canon EOS 1D Mark III	2007
Canon EOS 850D	2020

Type of camera

Both these cameras are DSLR cameras. No difference there.

Sensors / crop factor

These cameras have different sensors. Canon EOS 1D Mark III has a "Canon APS-H"-sensor while Canon EOS 850D has a "Canon APS-C"-sensor, and their difference in sensors will also affect the crop factor and experience focal length. See the table below.

Camera	Focal length, 50mm f/1.8 **
Canon EOS 1D Mark III	65 mm Canon APS-H sensor Crop factor/focal length multiplier by * 1.3
Canon EOS 850D	80 mm Canon APS-C sensor Crop factor/focal length multiplier by * 1.6

** 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 1D Mark III has a 10,1 MP (Megapixels) resolution while Canon EOS 850D has 24 MP. If we break down this in more detail this is the data behind the numbers:

Camera	Megapixels
Canon EOS 1D Mark III	10,1 MP 10077696 pixels 3888 x 2592
Canon EOS 850D	24 MP 24000000 pixels 6000 x 4000

Canon EOS 850D has a 138 % larger resolution than Canon EOS 1D 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 850D has a larger ISO-range than Canon EOS 1D Mark III. Canon EOS 850D has an ISO range that stretches from 100 to 25600 while Canon EOS 1D Mark III has 50 to 6400.

Camera	ISO Range
Canon EOS 1D Mark III	50-6400
Canon EOS 850D	100-25600

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 1D Mark III
Lens compatibility chart for Canon EOS 850D

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Canon EOS 1D Mark III can shoot up to 10 pictures per seconds and Canon EOS 850D can shoot up to 7,5 pictures per seconds.

Camera	FPS (Frames per second)
Canon EOS 1D Mark III	10
Canon EOS 850D	7,5

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 Canon EOS 850D. Sadly, the Canon EOS 1D Mark III 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.

Canon EOS 1D Mark III weighs 1155 gr (equal to 2,55 lb) which is 124% heavier than Canon EOS 850D and its 515 gr (or 1,14 lb).

Camera	Weight
Canon EOS 1D Mark III	1155 gr 2,55 lb
Canon EOS 850D	515 gr 1,14 lb