Sony a7S III vs Sony a99

This is a full comparison between the cameras Sony a7S III and Sony a99. We compare them by looking at the categories you see below.

Manufacturing

These cameras are both manufactured by Sony.

Type of camera

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.

** 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 a7S III has a 12 MP (Megapixels) resolution while Sony a99 has 24 MP. If we break down this in more detail this is the data behind the numbers:

Sony a99 has a 100 % 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 a99. Sony a7S III has an ISO range that stretches from 80 to 102400 while Sony a99 has 100 to 25600.

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 a7S III
Lens compatibility chart for Sony a99

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Sony a7S III can shoot up to 10 pictures per seconds and Sony a99 can shoot up to 6 pictures per seconds.

Ability to record movies

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

In this case, both Sony a7S III and Sony a99 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 a99 weighs 812 gr (equal to 1.79 lb) which is 16% heavier than Sony a7S III and its 699 gr (or 1.54 lb).

Sony a7S III vs Sony a99 Specs

Below you will find the complete and detailed technical specs for both Sony a7S III and Sony a99, 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 a7S III	Sony a99
Name	Sony a7S III	Sony a99
Manufacturer	Sony	Sony
Release Date and Price	Sony a7S III	Sony a99
Release Year	2020	2012
Release Date	2020-07-28	2012-09-12
MSRP	3499 USD	2799 USD
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Camera Type	Sony a7S III	Sony a99
Camera Type	Mirrorless	SLT
Sensor	Sony a7S III	Sony a99
Sensor Size	Full Frame (approx 36 x 24 mm)	Full Frame (approx 36 x 24 mm)
Sensor Type	BSI-CMOS	CMOS
Resolution	4240 x 2832 pixels	6000 x 4000 pixels
Megapixels	12 MP	24 MP
Image Processor	Bionz XR	Bionz
Image	Sony a7S III	Sony a99
ISO Range	80 - 102400	100 - 25600
White Balance Presets	7	8
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 a7S III	Sony a99
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 Tracking Single Continuous Face Detection LiveView
Focus Points	759	19
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	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 a7S III	Sony a99
Articulated LCD	Fully articulated	Fully articulated
Screen size	3”	3”
Screen dots	1440000	1229000
Touch screen	Yes	No
Screen type	TFT LCD	TFT Xtra Fine color LCD
Live view	Yes	Yes
Viewfinder Type	Electronic	Electronic
Viewfinder Coverage	100%	100%
Viewfinder Magnification	0.91x	0.71×
Viewfinder Resolution	9440000	N/A
Photography features	Sony a7S III	Sony a99
Frames per second	10 fps	6 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	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 a7S III	Sony a99
Video recording	Yes	Yes
Video format	MPEG4 H.264 H.265 XAVC-S XAVC-HS	MPEG4 H.264 AVCHD
Video resolution	1920 x 1080 3840 x 2160	1440 x 1080 1920 x 1080
Built-in Microphone	Yes	Yes
Built-in Speakers	Yes	Yes
Storage	Sony a7S III	Sony a99
Memory Card	Compact Flash Express SD/SDHC	Memory Stick Pro Duo SD/SDHC
Connectivity	Sony a7S III	Sony a99
HDMI Output	Yes	Yes
Microphone Port	Yes	No
Headphone Port	Yes	No
Wireless	Yes Built-in (802.11ac (dual band) + Bluetooth)	No
Remote Control	Yes (wireless or smartphone)	Yes (Wired or Wireless (Optional))
GPS	No	Yes Built-in
Body & Dimensions	Sony a7S III	Sony a99
Enviromentally sealed	Yes	Yes
Battery	Battery Pack	Battery Pack
Battery Details	NP-FZ100 lithium-ion battery charger	Lithium-Ion NP-FM500H rechargeable battery & charger
Battery Life (CIPA)	600 shots	500 shots
Width	129 mm	147 mm
Height	97 mm	111 mm
Depth	81 mm	78 mm
Weight	699 gram	812 gram