Sony a55 vs Nikon D7100

This is a full comparison between the cameras Sony a55 and Nikon D7100. We compare them by looking at the categories you see below.

Sony a55

Nikon D7100

Manufacturing

Sony a55 is manufacturered by Sony but Nikon D7100 is from Nikon. Both Sony and Nikon are well known brands though.

Sony a55 were released 2010 and Nikon D7100 was released 2013. That is a 3 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera	Released
Sony a55	2010
Nikon D7100	2013

Type of camera

Sensors / crop factor

These cameras have different sensors. Sony a55 has a "Sony APS-C"-sensor while Nikon D7100 has a "Nikon DX"-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 **
Sony a55	75 mm Sony APS-C sensor Crop factor/focal length multiplier by * 1.5
Nikon D7100	75 mm Nikon DX sensor Crop factor/focal length multiplier by * 1.5

** 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 a55 has a 16 MP (Megapixels) resolution while Nikon D7100 has 24,1 MP. If we break down this in more detail this is the data behind the numbers:

Camera	Megapixels
Sony a55	16 MP 16032768 pixels 4912 x 3264
Nikon D7100	24,1 MP 24000000 pixels 6000 x 4000

Nikon D7100 has a 50 % larger resolution than Sony a55. 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 a55 has a larger ISO-range than Nikon D7100. Sony a55 has an ISO range that stretches from 100 to 12800 while Nikon D7100 has 100 to 6400.

Camera	ISO Range
Sony a55	100-12800
Nikon D7100	100-6400

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 a55
Lens compatibility chart for Nikon D7100

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Sony a55 can shoot up to 10 pictures per seconds and Nikon D7100 can shoot up to 6 pictures per seconds.

Camera	FPS (Frames per second)
Sony a55	10
Nikon D7100	6

Ability to record movies

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

In this case, both Sony a55 and Nikon D7100 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 D7100 weighs 675 gr (equal to 1.49 lb) which is 35% heavier than Sony a55 and its 500 gr (or 1.1 lb).

Camera	Weight
Sony a55	500 gr 1.1 lb
Nikon D7100	675 gr 1.49 lb