Sony a7R IV vs Nikon D90

This is a full comparison between the cameras Sony a7R IV and Nikon D90. We compare them by looking at the categories you see below.

Sony a7R IV

Nikon D90

Manufacturing

Sony a7R IV is manufacturered by Sony but Nikon D90 is from Nikon. Both Sony and Nikon are well known brands though.

Sony a7R IV were released 2019 and Nikon D90 was released 2008. That is a 11 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera	Released
Sony a7R IV	2019
Nikon D90	2008

Type of camera

Sony a7R IV is a Mirrorless camera while Nikon D90 is a DSLR camera. More information about their differences will come soon.

Sensors / crop factor

These cameras have different sensors. Sony a7R IV has a "Sony Full Frame"-sensor while Nikon D90 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 a7R IV	50 mm Full-frame sensor No crop factor/focal length multiplier
Nikon D90	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 a7R IV has a 61 MP (Megapixels) resolution while Nikon D90 has 12,3 MP. If we break down this in more detail this is the data behind the numbers:

Camera	Megapixels
Sony a7R IV	61 MP 60217344 pixels 9504 x 6336
Nikon D90	12,3 MP 12212224 pixels 4288 x 2848

Sony a7R IV has a 393 % larger resolution than Nikon D90. 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 a7R IV has a larger ISO-range than Nikon D90. Sony a7R IV has an ISO range that stretches from 100 to 32000 while Nikon D90 has 200 to 6400.

Camera	ISO Range
Sony a7R IV	100-32000
Nikon D90	200-6400

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 a7R IV
Lens compatibility chart for Nikon D90

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Sony a7R IV can shoot up to 10 pictures per seconds and Nikon D90 can shoot up to 4,5 pictures per seconds.

Camera	FPS (Frames per second)
Sony a7R IV	10
Nikon D90	4,5

Ability to record movies

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

In this case, both Sony a7R IV and Nikon D90 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 D90 weighs 703 gr (equal to 1.55 lb) which is 6% heavier than Sony a7R IV and its 665 gr (or 1.47 lb).

Camera	Weight
Sony a7R IV	665 gr 1.47 lb
Nikon D90	703 gr 1.55 lb