Canon EOS 40D vs Nikon D3100

This is a full comparison between the cameras Canon EOS 40D and Nikon D3100. We compare them by looking at the categories you see below.

Canon EOS 40D
Nikon D3100

Manufacturing

Canon EOS 40D is manufacturered by Canon but Nikon D3100 is from Nikon. Both Canon and Nikon are well known brands though.

Canon EOS 40D were released 2007 and Nikon D3100 was released 2010. That is a 3 years difference. In tech, this period of time can be of interest since technology is always improving etc.

Camera Manufacturer Released
Canon EOS 40D Canon 2007
Nikon D3100 Nikon 2010

Type of camera

Both these cameras are DSLR cameras. No difference there.

Sensors / crop factor

These cameras have different sensors. Canon EOS 40D has a "APSC"-sensor while Nikon D3100 has a "DX"-sensor, and their difference in sensors will also effect the crop factor and experience focal length. See the table below.

Camera Experienced focal length when using a lens with 50mm focal length (ex a common "50mm f/1.8")
Canon EOS 40D 80 mm (a Canon APS-C sensor have a crop factor / focal length multiplier by * 1.6)
Nikon D3100 75 mm (a Nikon DX sensor have a crop factor / focal length multiplier by * 1.5)

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

Resolution

Canon EOS 40D has a 10,1 MP (Megapixels) resolution while Nikon D3100 has 14,2 MP. If we break down this in more detail this is the data behind the numbers:

Camera Megapixels Pixel (total) Pixels (width) Pixels (height)
Canon EOS 40D 10,1 MP 10077696 3888 2592
Nikon D3100 14,2 MP 14155776 4608 3072

Nikon D3100 has a 40 % larger resolution than Canon EOS 40D. This could give you more details in the picture but also a possibility to crop more in the pictures, afterwards while editing the pictures, if needed that is.

ISO range

Nikon D3100 has a larger ISO-range than Canon EOS 40D. Nikon D3100 has an ISO range that stretches from 100 to 12800 while Canon EOS 40D has 100 to 3200.

Camera ISO Range
Canon EOS 40D 100-3200
Nikon D3100 100-12800

Autofocus and lens compatibility

There is a big diffence between these two cameras. Canon EOS 40D has a built-in autofocus motor but Nikon D3100 does not. If you want to be able to use autofocus on Nikon D3100 there is a need for having an autofocus motor inside the lens. We really encourage you to look closely at our lens compatibility charts at the links below.

Lens compatibility chart for Canon EOS 40D
Lens compatibility chart for Nikon D3100

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definately be of interest. Canon EOS 40D can shoot up to 6,5 pictures per seconds and Nikon D3100 can shoot up to 3 pictures per seconds.

Camera FPS (Frames per second)
Canon EOS 40D 6,5
Nikon D3100 3

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 of movies and movie clips and that is Nikon D3100. Sadly, the Canon EOS 40D 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, carried around, for several hours at the time.

Canon EOS 40D weighs 822 gr (equal to 1,81 lb) which is 63% heavier than Nikon D3100 and its 505 gr (or 1,11 lb).

Camera Weight (in gram) Weight (in pounds)
Canon EOS 40D 822 gr 1,81 lb
Nikon D3100 505 gr 1,11 lb