Sony a7R IV vs Sony a99

This is a full comparison between the cameras Sony a7R IV and Sony a99. We compare them by looking at the categories you see below.

Sony a7R IV

Sony a99

Manufacturing

These cameras are both manufactured by Sony.

Sony a7R IV were released 2019 and Sony a99 was released 2012. That is a 7 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera	Released
Sony a7R IV	2019
Sony a99	2012

Type of camera

Sensors / crop factor

Both these cameras have the same sorts of sensor (called "Sony Full Frame") 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.

Camera	Focal length, 50mm f/1.8 **
Sony a7R IV	50 mm Full-frame sensor No crop factor/focal length multiplier
Sony a99	50 mm Full-frame sensor No crop factor/focal length multiplier

** 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)

Resolution

Sony a7R IV has a 61 MP (Megapixels) resolution while Sony a99 has 24 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
Sony a99	24 MP 24000000 pixels 6000 x 4000

Sony a7R IV has a 151 % larger resolution than Sony a99. 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 Sony a99. Sony a7R IV has an ISO range that stretches from 100 to 32000 while Sony a99 has 100 to 25600.

Camera	ISO Range
Sony a7R IV	100-32000
Sony a99	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 Sony a7R IV
Lens compatibility chart for Sony a99

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 Sony a99 can shoot up to 6 pictures per seconds.

Camera	FPS (Frames per second)
Sony a7R IV	10
Sony a99	6

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 Sony a99 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.

Sony a99 weighs 812 gr (equal to 1.79 lb) which is 22% heavier than Sony a7R IV and its 665 gr (or 1.47 lb).

Camera	Weight
Sony a7R IV	665 gr 1.47 lb
Sony a99	812 gr 1.79 lb