Olympus E-M5 III vs Pentax K-3

In this article, we will be matching up the Olympus E-M5 III and Pentax K-3, former is a Advanced Mirrorless while the latter is a Advanced DSLR by rivals Olympus and Pentax. The image resolution of the E-M5 III (20MP) and the K-3 (24MP) is pretty comparable but the E-M5 III (Four Thirds) and K-3 (APS-C) enjoy different sensor measurements.

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The E-M5 III was brought out 5 years after the K-3 which is a fairly large difference as far as camera technology is concerned. Both of these cameras offer different body type with the Olympus E-M5 III being a SLR-style mirrorless camera and the Pentax K-3 being a Mid-size SLR camera.

Before delving in to a comprehensive comparison, below is a short highlight of how the E-M5 III grades versus the K-3 when considering portability, imaging, features and an overall mark.

This is a preview of the gallery images for Olympus OM-D E-M5 III & Pentax K-3. The entire galleries are viewable at Olympus E-M5 III Gallery & Pentax K-3 Gallery.

If you are looking to travel with your camera frequently, you will have to think about its weight and size. The Olympus E-M5 III provides external measurements of 125mm x 85mm x 50mm (4.9" x 3.3" x 2.0") accompanied by a weight of 414 grams (0.91 lbs) whilst the Pentax K-3 has specifications of 131mm x 100mm x 77mm (5.2" x 3.9" x 3.0") along with a weight of 800 grams (1.76 lbs).

Check out the Olympus E-M5 III and Pentax K-3 in our brand new Camera & Lens Size Comparison Tool.

Remember, the weight of an ILC will vary based on the lens you have chosen at that moment. Below is the front view over all size comparison of the E-M5 III against the K-3.

Considering dimensions and weight, the portability grade of the E-M5 III and K-3 is 80 and 59 respectively.

More often than not, it's tough to visualize the difference in sensor dimensions just by checking out specs. The picture here might provide you a greater sense of the sensor sizing in the E-M5 III and K-3.

As you can plainly see, the 2 cameras offer different megapixels and different sensor dimensions. The E-M5 III due to its smaller sensor is going to make getting shallower depth of field trickier and the Pentax K-3 will show more detail having its extra 4MP. Higher resolution will help you crop pictures a little more aggressively. The fresher E-M5 III should have a benefit with regard to sensor technology.