Unleashing the Power of Pentax K-3 Mark III: A Comprehensive Review

Explore the top-rated Pentax K-3 Mark III camera, a powerful DSLR that has taken the market by storm. Read on to find out more about the key features, functionalities, and performance attributes that make this camera a must-have for photography enthusiasts.

Written by Victor Chan | Updated: Mon May 01 2023

Pentax K-3 Mark III article cover photo

Key Features

Mar 31 2021


26 megapixels


Sensor TypeAPS-C

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Overview of the K-3 Mark III

If you're an avid photographer looking for a robust DSLR camera that embodies timeless precision and innovation, look no further than the Pentax K-3 Mark III. With its fast autofocus system, high-resolution sensor, and advanced stabilization technology, this camera delivers outstanding performance in even the most challenging shooting conditions. In this comprehensive review, we'll explore the key features of the Pentax K-3 Mark III, highlighting its strengths and weaknesses to help you make an informed purchase decision. So sit back, relax, and prepare to be amazed as we unleash the power of this spectacular camera.

Pentax K-3 Mark III Pros and Cons

Now, we will look more closely at our review of the Pentax K-3 Mark 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!


High resolution (25.7 MP)
Weather sealing for outdoor use
Fast autofocus (27 point SAFOX 13)
Ergonomic design for comfortable handling
Advanced Shake Reduction system
High-speed shooting (12 fps)
Large optical viewfinder (100% coverage)
High ISO performance (up to 1,600,000)
Built-in GPS and Wi-Fi


Pricey compared to other similar cameras
Limited lens selection compared to Canon or Nikon
Battery life is not as long as other cameras in its class
No built-in flash
Heavy weight (about 890 grams)
Limited video capabilities compared to other cameras (no 4K recording)
Learning curve for beginners due to advanced features
Not as widely available as other DSLRs on the market

Build and Construction

Body and dimensions

Pentax K-3 Mark III

Weather sealed
Dimensions135 x 104 x 74mm

Weather Sealing

The Pentax K-3 Mark 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 K-3 Mark III is an excellent choice.

Design and Handling

Main design features

View FinderOptical (pentaprism)
Screen TypeFixed Type
Screen Resolution1,620k dots
Body typeMid-size SLR

Suitable for:

PhotographyAbove Avg.
VideographyAbove Avg.
TravelAbove Avg.

LCD Screen

This camera has a fixed type 3.20" screen, with a display resolution of 1,620k dots. This makes the Pentax K-3 Mark III not as suitable for those looking for a vlogging camera as you cannot view yourself while shooting selfies easily. The camera also features a touch screen, which adds to its ease of use.


K-3 Mark III includes a optical (pentaprism) viewfinder with no electronic viewfinder of resolution with a coverage of 100% and a magnification of 0.7x. This feature enhances the camera's suitability for outdoor photography in bright conditions.

Image Quality

Pentax K-3 Mark III has a 26MP sized CMOS sensor. You can shoot at maximum resolution of 26 pixels. Pentax K-3 Mark III has a native ISO range of 100 - 1600000 which can be boosted to null - null. It can also save files in RAW format which gives you a wider room for post processing.

Key Features

Mar 31 2021


100 - 1600000

ISO Range

Extended ISOnull - null
Max resolution6192 x 4128 pixels

DXO Sensor Scores


not tested

Color Depth

not tested

Dynamic Range

not tested

Low Light ISO

not tested

DXO mark sensor scores

The DXOmark rankings indicate that the Pentax K-3 Mark 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 excellent, 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 K-3 Mark III is excellent

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: APS-C



Connectivity, storage, battery

StorageDual SD/SDHC/SDXC slots (UHS-II supported in slot 1)
Battery Life800 shots
Battery ModelD-LI90
Wireless Connectivity


The Pentax K-3 Mark III supports Dual SD/SDHC/SDXC slots (UHS-II supported in slot 1) with 2 slots for storage. Having dual SD card slots on the Pentax K-3 Mark 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 Pentax K-3 Mark III uses the D-LI90 model of battery pack. This is rated for 800 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 Pentax K-3 Mark 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 Pentax K-3 Mark 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 Pentax K-3 Mark III includes two autofocus (AF) systems: contrast detection and phase detection, with 101 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 Pentax K-3 Mark III?

The Pentax K-3 Mark III features a CMOS sensor

Is the Pentax K-3 Mark III weather sealed?

Yes the K-3 Mark III does have weather sealing.

When was the Pentax K-3 Mark III announced?

The Pentax K-3 Mark III was announced on Mar 31 2021

Does the Pentax K-3 Mark III have in-body image stabilization?

Yes the K-3 Mark 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 Pentax K-3 Mark III?

The K-3 Mark III has a native ISO range of 100-1600000, which can be expanded to ISO null-null for even greater sensitivity in low light conditions.

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