Fujifilm GFX 100S vs Fujifilm X-A3

This is a full comparison between the cameras Fujifilm GFX 100S and Fujifilm X-A3. We compare them by looking at the categories you see below.

Manufacturing

These cameras are both manufactured by Fujifilm.

Fujifilm GFX 100S were released 2021 and Fujifilm X-A3 was released 2016. That is a 5 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera Released
Fujifilm GFX 100S 2021
Fujifilm X-A3 2016

Type of camera

Both these cameras are Mirrorless cameras. No difference there.

Sensors / crop factor

These cameras have different sensors. Fujifilm GFX 100S has a "Fujifilm Medium Format"-sensor while Fujifilm X-A3 has a "Fujifilm APS-C"-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 **
Fujifilm GFX 100S 39.5 mm
Fujifilm Medium Format sensor
Crop factor/focal length multiplier by * 0.79
Fujifilm X-A3 75 mm
Fujifilm 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:

Resolution

Fujifilm GFX 100S has a 102 MP (Megapixels) resolution while Fujifilm X-A3 has 24 MP. If we break down this in more detail this is the data behind the numbers:

Camera Megapixels
Fujifilm GFX 100S 102 MP
101756928 pixels
11648 x 8736
Fujifilm X-A3 24 MP
24000000 pixels
6000 x 4000

Fujifilm GFX 100S has a 324 % larger resolution than Fujifilm X-A3. 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

Fujifilm GFX 100S has a larger ISO-range than Fujifilm X-A3. Fujifilm GFX 100S has an ISO range that stretches from 100 to 12800 while Fujifilm X-A3 has 200 to 6400.

Camera ISO Range
Fujifilm GFX 100S 100-12800
Fujifilm X-A3 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 Fujifilm GFX 100S
Lens compatibility chart for Fujifilm X-A3

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Fujifilm GFX 100S can shoot up to 5 pictures per seconds and Fujifilm X-A3 can shoot up to 6 pictures per seconds.

Camera FPS (Frames per second)
Fujifilm GFX 100S 5
Fujifilm X-A3 6

Ability to record movies

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

In this case, both Fujifilm GFX 100S and Fujifilm X-A3 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.

Fujifilm GFX 100S weighs 900 gr (equal to 1.98 lb) which is 165% heavier than Fujifilm X-A3 and its 339 gr (or 0.75 lb).

Camera Weight
Fujifilm GFX 100S 900 gr
1.98 lb
Fujifilm X-A3 339 gr
0.75 lb

Fujifilm GFX 100S vs Fujifilm X-A3 Specs

Below you will find the complete and detailed technical specs for both Fujifilm GFX 100S and Fujifilm X-A3, 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
Fujifilm GFX 100S
Fujifilm X-A3
Name Fujifilm GFX 100S Fujifilm X-A3
Manufacturer Fujifilm Fujifilm
Release Date and Price
Fujifilm GFX 100S
Fujifilm X-A3
Release Year 2021 2016
Release Date 2021-01-27 2016-08-25
MSRP 5999 USD 599 USD
Buy it today
Camera Type
Fujifilm GFX 100S
Fujifilm X-A3
Camera Type Mirrorless Mirrorless
Sensor
Fujifilm GFX 100S
Fujifilm X-A3
Sensor Size Medium Format (approx 44 x 33 mm) APS-C (approx 23.5 x 15.6 mm)
Sensor Type BSI-CMOS CMOS
Resolution 11648 x 8736 pixels 6000 x 4000 pixels
Megapixels 102 MP 24 MP
Image Processor X-Processor 4 EXR Processor II
Image
Fujifilm GFX 100S
Fujifilm X-A3
ISO Range 100 - 12800 200 - 6400
White Balance Presets 7 7
Custom White Balance Yes Yes
Image Stabilization Yes
(Sensor-Shift)
No
Image Stabilization CIPA Rating 6 stops 0 stops
Uncompressed format RAW + TIFF RAW
Optics & Focus
Fujifilm GFX 100S
Fujifilm X-A3
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)
Multi Area
Center
Selective Single Point
Tracking
Single
Continuous
Touch
Face Detection
LiveView
Focus Points 425 77
Lens Mount Fujifilm G

See Compatible Lenses
Fujifilm X

See Compatible Lenses
Focal Length Multiplier Medium Format
0.79x multiplier
Example:
24 mm becomes 19 mm
50 mm becomes 40 mm
100 mm becomes 79 mm
200 mm becomes 158 mm
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
Screen & Viewfinder
Fujifilm GFX 100S
Fujifilm X-A3
Articulated LCD Tilting Tilting
Screen size 3.2” 3”
Screen dots 2360000 1040000
Touch screen Yes Yes
Screen type TFT LCD TFT LCD
Live view Yes Yes
Viewfinder Type Electronic No Viewfinder
Viewfinder Coverage 100%
Viewfinder Magnification 0.61× (0.77× 35mm equiv.)
Viewfinder Resolution 3690000 0
Photography features
Fujifilm GFX 100S
Fujifilm X-A3
Frames per second 5 fps 6 fps
Minimum Shutter Speed 30 seconds 30 seconds
Maximum Shutter Speed 1/4000 seconds 1/4000 seconds
Built-in Flash No Yes
Built-in Flash Range N/A 7 meters
External Flash Yes Yes
Self-Timer Yes Yes
Time-lapse Yes No
Metering modes Multi
Center Weighted
Spot
Average
Multi
Spot
Average
Exposure Compensation +/- 5 (at 1/3 EV steps) +/- 3 (at 1/3 EV steps)
Videography features
Fujifilm GFX 100S
Fujifilm X-A3
Video recording Yes Yes
Video format MPEG4
H.264
H.265
MPEG4
H.264
Video resolution 1920 x 1080
3840 x 2160
4096 x 2160
1280 x 720
1920 x 1080
Built-in Microphone Yes Yes
Built-in Speakers Yes Yes
Storage
Fujifilm GFX 100S
Fujifilm X-A3
Memory Card SD/SDHC
SD/SDHC
Connectivity
Fujifilm GFX 100S
Fujifilm X-A3
HDMI Output Yes Yes
Microphone Port Yes No
Headphone Port Yes No
Wireless Yes
Built-in (802.11 b/g/n + Bluetooth)
Yes
Built-in (802.11b/g/n)
Remote Control Supported (no further information) Yes (wired or via smartphone)
GPS No No
Body & Dimensions
Fujifilm GFX 100S
Fujifilm X-A3
Enviromentally sealed Yes No
Battery Battery Pack Battery Pack
Battery Details NP-W235 lithium-ion battery & charger
NP-W126S lithium-ion battery & USB charger
Battery Life (CIPA) 460 shots 410 shots
Width 150 mm 117 mm
Height 104 mm 67 mm
Depth 87 mm 40 mm
Weight 900 gram 339 gram