Sony a6700 vs Sony a7R IIIA

This is a full comparison between the cameras Sony a6700 and Sony a7R IIIA. We compare them by looking at the categories you see below.

Sony a6700

Sony a7R IIIA

Manufacturing

These cameras are both manufactured by Sony.

Sony a6700 were released 2023 and Sony a7R IIIA was released 2021. That is a 2 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera	Released
Sony a6700	2023
Sony a7R IIIA	2021

Type of camera

Both these cameras are Mirrorless cameras. No difference there.

Sensors / crop factor

These cameras have different sensors. Sony a6700 has a "Sony APS-C"-sensor while Sony a7R IIIA has a "Sony Full Frame"-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 a6700	75 mm Sony APS-C sensor Crop factor/focal length multiplier by * 1.5
Sony a7R IIIA	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 a6700 has a 26 MP (Megapixels) resolution while Sony a7R IIIA has 42 MP. If we break down this in more detail this is the data behind the numbers:

Camera	Megapixels
Sony a6700	26 MP 25560576 pixels 6192 x 4128
Sony a7R IIIA	42 MP 42177408 pixels 7952 x 5304

Sony a7R IIIA has a 65 % larger resolution than Sony a6700. 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

Both of these cameras offer the exact same ISO range. They both have 100 to 32000.

Camera	ISO Range
Sony a6700	100-32000
Sony a7R IIIA	100-32000

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 a6700
Lens compatibility chart for Sony a7R IIIA

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Sony a6700 can shoot up to 11 pictures per seconds and Sony a7R IIIA can shoot up to 10 pictures per seconds.

Camera	FPS (Frames per second)
Sony a6700	11
Sony a7R IIIA	10

Ability to record movies

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

In this case, both Sony a6700 and Sony a7R IIIA 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 a7R IIIA weighs 657 gr (equal to 1.45 lb) which is 33% heavier than Sony a6700 and its 493 gr (or 1.09 lb).

Camera	Weight
Sony a6700	493 gr 1.09 lb
Sony a7R IIIA	657 gr 1.45 lb