Sony a7R IVA vs Sony a7S III

This is a full comparison between the cameras Sony a7R IVA and Sony a7S III. We compare them by looking at the categories you see below.

Manufacturing

These cameras are both manufactured by Sony.

Sony a7R IVA were released 2021 and Sony a7S III was released 2020. That is a 1 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera Released
Sony a7R IVA 2021
Sony a7S III 2020

Type of camera

Both these cameras are Mirrorless cameras. No difference there.

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 IVA 50 mm
Full-frame sensor
No crop factor/focal length multiplier
Sony a7S III 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 IVA has a 61 MP (Megapixels) resolution while Sony a7S III has 12 MP. If we break down this in more detail this is the data behind the numbers:

Camera Megapixels
Sony a7R IVA 61 MP
60217344 pixels
9504 x 6336
Sony a7S III 12 MP
12007680 pixels
4240 x 2832

Sony a7R IVA has a 401 % larger resolution than Sony a7S III. 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 a7S III has a larger ISO-range than Sony a7R IVA. Sony a7S III has an ISO range that stretches from 80 to 102400 while Sony a7R IVA has 100 to 32000.

Camera ISO Range
Sony a7R IVA 100-32000
Sony a7S III 80-102400

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 IVA
Lens compatibility chart for Sony a7S III

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Sony a7R IVA can shoot up to 10 pictures per seconds and Sony a7S III can shoot up to 10 pictures per seconds.

Camera FPS (Frames per second)
Sony a7R IVA 10
Sony a7S III 10

Ability to record movies

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

In this case, both Sony a7R IVA and Sony a7S III 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 a7S III weighs 699 gr (equal to 1.54 lb) which is 5% heavier than Sony a7R IVA and its 665 gr (or 1.47 lb).

Camera Weight
Sony a7R IVA 665 gr
1.47 lb
Sony a7S III 699 gr
1.54 lb

Sony a7R IVA vs Sony a7S III Specs

Below you will find the complete and detailed technical specs for both Sony a7R IVA and Sony a7S III, next to each other. Each category of data is a link to an article covering the subject, giving you a deeper understanding so you can better understand the strengths and weaknesses of the two camera models.

Product
Sony a7R IVA
Sony a7S III
Name Sony a7R IVA Sony a7S III
Manufacturer Sony Sony
Release Date and Price
Sony a7R IVA
Sony a7S III
Release Year 2021 2020
Release Date 2021-04-07 2020-07-28
MSRP 3499 USD 3499 USD
Buy it today
Camera Type
Sony a7R IVA
Sony a7S III
Camera Type Mirrorless Mirrorless
Sensor
Sony a7R IVA
Sony a7S III
Sensor Size Full Frame (approx 36 x 24 mm) Full Frame (approx 36 x 24 mm)
Sensor Type BSI-CMOS BSI-CMOS
Resolution 9504 x 6336 pixels 4240 x 2832 pixels
Megapixels 61 MP 12 MP
Image Processor BIONZ X Bionz XR
Image
Sony a7R IVA
Sony a7S III
ISO Range 100 - 32000 80 - 102400
White Balance Presets 9 7
Custom White Balance No Yes
Image Stabilization Yes
(Sensor-Shift)
Yes
(Sensor-Shift (5-axis))
Image Stabilization CIPA Rating 5.5 stops 5.5 stops
Uncompressed format RAW RAW
Optics & Focus
Sony a7R IVA
Sony a7S III
Autofocus Motor Yes Yes
Autofocus Contract Detect (sensor)
Phase Detect
Multi Area
Center
Selective Single Point
Tracking
Single
Continuous
Touch
Face Detection
LiveView
Contract Detect (sensor)
Phase Detect
Multi Area
Center
Selective Single Point
Tracking
Single
Continuous
Touch
Face Detection
LiveView
Focus Points 567 759
Lens Mount Sony E

See Compatible Lenses
Sony E

See Compatible Lenses
Focal Length Multiplier Full frame
No multiplier
Example:
24 mm remains 24 mm
50 mm remains 50 mm
100 mm remains 100 mm
200 mm remains 200 mm
Full frame
No multiplier
Example:
24 mm remains 24 mm
50 mm remains 50 mm
100 mm remains 100 mm
200 mm remains 200 mm
Screen & Viewfinder
Sony a7R IVA
Sony a7S III
Articulated LCD Tilting Fully articulated
Screen size 3” 3”
Screen dots 2360000 1440000
Touch screen Yes Yes
Screen type TFT LCD TFT LCD
Live view Yes Yes
Viewfinder Type Electronic Electronic
Viewfinder Coverage 100% 100%
Viewfinder Magnification 0.78x 0.91x
Viewfinder Resolution 5760000 9440000
Photography features
Sony a7R IVA
Sony a7S III
Frames per second 10 fps 10 fps
Minimum Shutter Speed 30 seconds 30 seconds
Maximum Shutter Speed 1/8000 seconds 1/8000 seconds
Built-in Flash No No
Built-in Flash Range N/A N/A
External Flash Yes Yes
Self-Timer Yes Yes
Time-lapse Yes No
Metering modes Multi
Center Weighted
Highlight Weighted
Spot
Average
Multi
Center Weighted
Highlight Weighted
Spot
Average
Exposure Compensation +/- 5 (at 1/3 EV, 1/2 EV steps) +/- 5 (at 1/3 EV, 1/2 EV steps)
Videography features
Sony a7R IVA
Sony a7S III
Video recording Yes Yes
Video format MPEG4
H.264
XAVC-S
MPEG4
H.264
H.265
XAVC-S
XAVC-HS
Video resolution 1920 x 1080
3840 x 2160
1920 x 1080
3840 x 2160
Built-in Microphone Yes Yes
Built-in Speakers Yes Yes
Storage
Sony a7R IVA
Sony a7S III
Memory Card SD/SDHC
Compact Flash Express
SD/SDHC
Connectivity
Sony a7R IVA
Sony a7S III
HDMI Output Yes Yes
Microphone Port Yes Yes
Headphone Port Yes Yes
Wireless Yes
Built-in (802.11ac + Bluetooth 4.1 + NFC)
Yes
Built-in (802.11ac (dual band) + Bluetooth)
Remote Control Yes (via smartphone) Yes (wireless or smartphone)
GPS No No
Body & Dimensions
Sony a7R IVA
Sony a7S III
Enviromentally sealed Yes Yes
Battery Battery Pack Battery Pack
Battery Details NP-FZ100 lithium-ion battery & charger
NP-FZ100 lithium-ion battery charger
Battery Life (CIPA) 670 shots 600 shots
Width 129 mm 129 mm
Height 96 mm 97 mm
Depth 78 mm 81 mm
Weight 665 gram 699 gram