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.

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

Sony a6700 vs Sony a7R IIIA Specs

Below you will find the complete and detailed technical specs for both Sony a6700 and Sony a7R IIIA, 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 a6700
Sony a7R IIIA
Name Sony a6700 Sony a7R IIIA
Manufacturer Sony Sony
Release Date and Price
Sony a6700
Sony a7R IIIA
Release Year 2023 2021
Release Date 2023-07-12 2021-04-07
MSRP 1399 USD 3199 USD
Buy it today
Camera Type
Sony a6700
Sony a7R IIIA
Camera Type Mirrorless Mirrorless
Sensor
Sony a6700
Sony a7R IIIA
Sensor Size APS-C (approx 23.5 x 15.6 mm) Full Frame (approx 36 x 24 mm)
Sensor Type BSI-CMOS BSI-CMOS
Resolution 6192 x 4128 pixels 7952 x 5304 pixels
Megapixels 26 MP 42 MP
Image Processor BIONZ XR BIONZ X
Image
Sony a6700
Sony a7R IIIA
ISO Range 100 - 32000 100 - 32000
White Balance Presets 10 10
Custom White Balance Yes Yes
Image Stabilization Yes
(Sensor-Shift (5-axis))
Yes
(Sensor-Shift (5-axis))
Image Stabilization CIPA Rating 5 stops 5.5 stops
Uncompressed format RAW RAW
Optics & Focus
Sony a6700
Sony a7R IIIA
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 759 399
Lens Mount Sony E

See Compatible Lenses
Sony E

See Compatible Lenses
Focal Length Multiplier APS-C Sensor (1.5x)
1.5x multiplier
Example:
24 mm becomes 36 mm
50 mm becomes 75 mm
100 mm becomes 150 mm
200 mm becomes 300 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 a6700
Sony a7R IIIA
Articulated LCD Fully articulated Tilting
Screen size 3” 3”
Screen dots 1036800 2360000
Touch screen Yes Yes
Screen type TFT LCD TFT LCD
Live view Yes Yes
Viewfinder Type Electronic Electronic
Viewfinder Coverage 100% 100%
Viewfinder Magnification 1.07× (0.71× 35mm equiv.) 0.78x
Viewfinder Resolution 2360000 3686400
Photography features
Sony a6700
Sony a7R IIIA
Frames per second 11 fps 10 fps
Minimum Shutter Speed 30 seconds 30 seconds
Maximum Shutter Speed 1/4000 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 No No
Metering modes Multi
Center Weighted
Highlight Weighted
Spot
Average
Multi
Center Weighted
Spot
Exposure Compensation +/- 5 (at 1/3 EV, 1/2 EV steps) +/- 5 (at 1/3 EV, 1/2 EV steps)
Videography features
Sony a6700
Sony a7R IIIA
Video recording Yes Yes
Video format H.264
H.265
XAVC-S
XAVC-HS
MPEG4
XAVC-S
AVCHD
Video resolution 3840 x 2160
1920 x 1080
3840 x 2160
Built-in Microphone Yes Yes
Built-in Speakers Yes Yes
Storage
Sony a6700
Sony a7R IIIA
Memory Card SD/SDHC
SD/SDHC
Connectivity
Sony a6700
Sony a7R IIIA
HDMI Output Yes Yes
Microphone Port Yes Yes
Headphone Port Yes Yes
Wireless Yes
Built-in (802.11ac MIMO 2x2)
Yes
Built-in (802.11b/g/n + NFC + Bluetooth)
Remote Control Yes (via App) Yes (wired, wireless, smartphone)
GPS No No
Body & Dimensions
Sony a6700
Sony a7R IIIA
Enviromentally sealed Yes Yes
Battery Battery Pack Battery Pack
Battery Details NP-FZ100
NP-FZ100 lithium-ion battery and charger
Battery Life (CIPA) 570 shots 650 shots
Width 122 mm 127 mm
Height 69 mm 96 mm
Depth 64 mm 74 mm
Weight 493 gram 657 gram