Sony a7R III vs Sony a100

This is a full comparison between the cameras Sony a7R III and Sony a100. We compare them by looking at the categories you see below.

Manufacturing

These cameras are both manufactured by Sony.

Sony a7R III were released 2017 and Sony a100 was released 2006. That is a 11 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera Released
Sony a7R III 2017
Sony a100 2006

Type of camera

Sony a7R III is a Mirrorless camera while Sony a100 is a DSLR camera. More information about their differences will come soon.

Sensors / crop factor

These cameras have different sensors. Sony a7R III has a "Sony Full Frame"-sensor while Sony a100 has a "Sony 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 **
Sony a7R III 50 mm
Full-frame sensor
No crop factor/focal length multiplier
Sony a100 75 mm
Sony APS-C 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:
Camera selection can affect the focal length (Sony)

Resolution

Sony a7R III has a 42 MP (Megapixels) resolution while Sony a100 has 10 MP. If we break down this in more detail this is the data behind the numbers:

Camera Megapixels
Sony a7R III 42 MP
42177408 pixels
7952 x 5304
Sony a100 10 MP
10036224 pixels
3872 x 2592

Sony a7R III has a 320 % larger resolution than Sony a100. 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 III has a larger ISO-range than Sony a100. Sony a7R III has an ISO range that stretches from 100 to 32000 while Sony a100 has 100 to 1600.

Camera ISO Range
Sony a7R III 100-32000
Sony a100 100-1600

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 III
Lens compatibility chart for Sony a100

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Sony a7R III can shoot up to 10 pictures per seconds and Sony a100 can shoot up to 3 pictures per seconds.

Camera FPS (Frames per second)
Sony a7R III 10
Sony a100 3

Ability to record movies

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

When comparing these two cameras there is only one of them that can shoot movies and that is Sony a7R III. Unfortunately Sony a100 does not support recording movies and movie clips.

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 III weighs 657 gr (equal to 1.45 lb) which is 3% heavier than Sony a100 and its 638 gr (or 1.41 lb).

Camera Weight
Sony a7R III 657 gr
1.45 lb
Sony a100 638 gr
1.41 lb

Sony a7R III vs Sony a100 Specs

Below you will find the complete and detailed technical specs for both Sony a7R III and Sony a100, 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 III
Sony a100
Name Sony a7R III Sony a100
Manufacturer Sony Sony
Release Date and Price
Sony a7R III
Sony a100
Release Year 2017 2006
Release Date 2017-10-25 2006-06-05
MSRP 3199 USD 899 USD
Buy it today
Camera Type
Sony a7R III
Sony a100
Camera Type Mirrorless DSLR
Sensor
Sony a7R III
Sony a100
Sensor Size Full Frame (approx 36 x 24 mm) APS-C (approx 23.5 x 15.6 mm)
Sensor Type BSI-CMOS CCD
Resolution 7952 x 5304 pixels 3872 x 2592 pixels
Megapixels 42 MP 10 MP
Image Processor Bionz X Bionz
Image
Sony a7R III
Sony a100
ISO Range 100 - 32000 100 - 1600
White Balance Presets 10 7
Custom White Balance Yes Yes
Image Stabilization Yes
(Sensor-Shift 5-axis)
Yes
(Sensor-Shift)
Image Stabilization CIPA Rating 5.5 stops 0 stops
Uncompressed format RAW RAW
Optics & Focus
Sony a7R III
Sony a100
Autofocus Motor Yes Yes
Autofocus Contract Detect (sensor)
Phase Detect
Multi Area
Center
Selective Single Point
Tracking
Single
Continuous
Touch
Face Detection
LiveView
Phase Detect
Multi Area
Selective Single Point
Single
Continuous
Focus Points 399 9
Lens Mount Sony E

See Compatible Lenses
Sony A

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
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
Sony a7R III
Sony a100
Articulated LCD Tilting No
Screen size 3” 2.5”
Screen dots 1440000 230000
Touch screen Yes No
Screen type TFT LCD N/A
Live view Yes No
Viewfinder Type Electronic Optical (pentamirror)
Viewfinder Coverage 100% 95%
Viewfinder Magnification 0.78x 0.83× (0.55× 35mm equiv.)
Viewfinder Resolution 3686400 N/A
Photography features
Sony a7R III
Sony a100
Frames per second 10 fps 3 fps
Minimum Shutter Speed 30 seconds 30 seconds
Maximum Shutter Speed 1/8000 seconds 1/4000 seconds
Built-in Flash No Yes
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
Spot
Multi
Center Weighted
Spot
Exposure Compensation +/- 5 (at 1/3 EV, 1/2 EV steps) +/- 2 (at 1/3 EV steps)
Videography features
Sony a7R III
Sony a100
Video recording Yes No
Video format MPEG4
H.264
AVCHD
N/A
Video resolution 1920 x 1080
3840 x 2160
N/A
Built-in Microphone Yes No
Built-in Speakers Yes No
Storage
Sony a7R III
Sony a100
Memory Card SD/SDHC
Compact Flash
Connectivity
Sony a7R III
Sony a100
HDMI Output Yes No
Microphone Port Yes No
Headphone Port Yes No
Wireless Yes
Built-in (802.11b/g/n + NFC + Bluetooth)
No
Remote Control Yes (wired, wireless, smartphone) Yes (Wire (Optional))
GPS No No
Body & Dimensions
Sony a7R III
Sony a100
Enviromentally sealed Yes No
Battery Battery Pack Battery Pack
Battery Details NP-FZ100 lithium-ion battery and charger
Lithium-Ion (NP-FM55H) & charger
Battery Life (CIPA) 650 shots 750 shots
Width 127 mm 133 mm
Height 96 mm 95 mm
Depth 74 mm 71 mm
Weight 657 gram 638 gram