Sony Alpha A7S III: A Game-Changer in Low-Light Photography

The Sony Alpha A7S III is the latest addition to Sony's famous line of mirrorless cameras. This camera boasts impressive low-light capabilities, along with many other features that make it a game-changer for both amateur and professional photographers. In this blog, we will dive deep into its stunning specs, advanced features, and everything you need to know about this camera.

Written by Victor Chan | Updated: Mon May 01 2023

Sony Alpha A7S III article cover photo

Key Features

Jul 21 2020


12 megapixels


Sensor TypeFull frame

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Overview of the Alpha A7S III

As a photographer, one essential feature that you would like to have in your camera is the ability to take great photos even in low-light situations. With the Sony Alpha A7S III, that's exactly what you get. The Alpha A7S III has an impressive sensor and new image processing engine that enables it to take clear and crisp photos even in low-light environments. This groundbreaking camera is the perfect tool for photographers in any setting, from capturing stunning nightscapes to creating cinematic films. In this blog, we'll explore all the features and capabilities of this fantastic camera, as well as discussing how it ranks among its competitors in the market.

The Sony Alpha Series Lineup

Sony Alpha A7S thumbnail

Sony Alpha A7S

Released Apr 06 2014 | 12MP resolution

Sony Alpha A7S II thumbnail

Sony Alpha A7S II

Released Oct 12 2015 | 12MP resolution

Sony Alpha A7S III thumbnail

Sony Alpha A7S III

Released Jul 21 2020 | 12MP resolution

Sony Alpha A7S III Pros and Cons

Now, we will look more closely at our review of the Sony Alpha A7S III camera. We will see what it can do and compare it to other cameras like it. We will tell you what's good about it and what's not so good. This way, you'll know if it's the camera for you!


Low light performance (great for night photography and video)
4K/120fps video capabilities
Excellent autofocus system
High dynamic range
Full-frame sensor
Vari-angle touchscreen display
Fast continuous shooting speed
Dual card slots
Good battery life


Limited resolution compared to other cameras in its price range
Heavy for a mirrorless camera
No built-in flash
Limited selection of lenses for Sony's E-mount
No 6K or 8K video capabilities
Weather-sealing could be better
Limited touchscreen functionality

Build and Construction

Body and dimensions

Sony Alpha A7S III

Weather sealed
Dimensions129 x 97 x 81mm

Weather Sealing

The Sony Alpha A7S III camera is equipped with environmental seals that make it resistant to weather, preventing water and dust from entering the camera. If you enjoy outdoor photography and need a camera that can handle extreme conditions, the Alpha A7S III is an excellent choice.

Design and Handling

Main design features

View FinderElectronic
Screen TypeFully articulated
Screen Resolution1,229k dots
Body typeSLR-style mirrorless

Suitable for:

PhotographyAbove Avg.
VideographyAbove Avg.
TravelAbove Avg.

LCD Screen

This camera has a fully articulated 3.00" screen, with a display resolution of 1,229k dots. This makes the Sony Alpha A7S III very suitable for those looking for a vlogging camera as you can view yourself while shooting selfies. The camera also features a touch screen, which adds to its ease of use.


Alpha A7S III includes a electronic viewfinder with 9,440k dots of resolution with a coverage of 100% and a magnification of 0.9x. This feature enhances the camera's suitability for outdoor photography in bright conditions.

Image Quality

Sony Alpha A7S III has a 12MP sized BSI-CMOS sensor. You can shoot at maximum resolution of 12 pixels. Sony Alpha A7S III has a native ISO range of 80 - 102400 which can be boosted to 50 - 409600. It can also save files in RAW format which gives you a wider room for post processing.

Key Features

Jul 21 2020


80 - 102400

ISO Range

SensorFull frame
Extended ISO50 - 409600
Max resolution4240 x 2832 pixels

DXO Sensor Scores


85 / 102

Color Depth

24.2 / 26.5

Dynamic Range

13.4 / 14.8

Low Light ISO

3900 / 4505

DXO mark sensor scores

The DXOmark rankings indicate that the Sony Alpha A7S III camera has excellent color depth performance, which refers to the number of colors the sensor can distinguish. Additionally, its dynamic range is also excellent, allowing it to retain high amounts of details in both bright and dark areas of a scene. The camera's low light ISO performance is above average, which is an important factor to consider if you plan to use it in dimly lit indoor environments or at night. Overall the image quality of the Alpha A7S III is above average

Crop Factor

Camera crop factor (or focal length multiplier) refers to how a camera's sensor size affects the apparent field of view of a lens. Crop factor is determined by comparing the size of a camera's sensor to that of a full-frame sensor, which is a standard reference size for camera sensors.

Size comparison

Medium FormatFull FrameAPS-C (Sony, Nikon)

Crop factor calculator

Crop factor


Full frame equivalent


This camera: Full frame



Connectivity, storage, battery

StorageDual SD/CFexpress Type A slots
Battery Life600 shots
Battery ModelNP-FZ100
Wireless Connectivity


The Sony Alpha A7S III supports Dual SD/CFexpress Type A slots with 2 slots for storage. Having dual SD card slots on the Sony Alpha A7S III is highly advantageous as it mitigates the risk of losing footage due to memory card malfunctions. This feature is particularly beneficial for wedding photography and other professional settings.


The Sony Alpha A7S III uses the NP-FZ100 model of battery pack. This is rated for 600 shots shots which is high. If you intend to take photos or record videos for an extended period, it might be a good idea to bring along additional batteries.

Photography Features


The Sony Alpha A7S III does not have a built-in flash, but it does offer a flash shoe that allows you to attach external flashes. This provides more versatility in your lighting choices.


The Sony Alpha A7S III boasts a maximum mechanical shutter speed of 1/8000s, which is ideal for shooting fast-moving subjects in bright environments, such as in sports photography. Faster shutter speeds enable you to freeze the action and capture every detail, making it easier to get the perfect shot.

With a continuous mechanical shutter speed of n/a or an electronic shutter speed of n/a, this camera is not capable of capturing the perfect moment more easily, making it not as suited for wedding, sports, and wildlife photography. Higher shutter speeds make it easier to capture fast-paced action, ensuring that you never miss the perfect shot.


The Sony Alpha A7S III includes two autofocus (AF) systems: contrast detection and phase detection, with 759 number of focus points.

While contrast detection is generally more accurate and precise, phase detection autofocus is faster and more effective in most situations, particularly when photographing moving subjects.

Phase detection autofocus works by dividing the incoming light into pairs and then analyzing how they intersect on the camera's sensor. This method allows the camera to determine not only if a subject is in focus but also the direction and distance needed to adjust the focus to achieve perfect sharpness.

On the other hand, contrast detection autofocus works by analyzing the contrast of an image and adjusting the focus until the highest contrast is detected. While this method is very accurate, it can be slow, especially in low light conditions or when photographing moving subjects.

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What is the sensor size of the Sony Alpha A7S III?

The Sony Alpha A7S III features a BSI-CMOS sensor

Is the Sony Alpha A7S III weather sealed?

Yes the Alpha A7S III does have weather sealing.

When was the Sony Alpha A7S III announced?

The Sony Alpha A7S III was announced on Jul 21 2020

Does the Sony Alpha A7S III have in-body image stabilization?

Yes the Alpha A7S III does have in-body image stabilization that can compensate for camera shake, making it easier to shoot handheld in low light conditions.

What is the ISO range of the Sony Alpha A7S III?

The Alpha A7S III has a native ISO range of 80-102400, which can be expanded to ISO 50-409600 for even greater sensitivity in low light conditions.

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