Olympus E-M10 III vs Pentax K-S1

Below, we will be reviewing the Olympus E-M10 III vs Pentax K-S1, one is a Entry-Level Mirrorless and the latter is a Advanced DSLR by rivals Olympus and Pentax. The resolution of the E-M10 III (16MP) and the K-S1 (20MP) is pretty comparable but the E-M10 III (Four Thirds) and K-S1 (APS-C) feature totally different sensor sizing.

Photography Glossary

The E-M10 III was released 3 years after the K-S1 which is a fairly serious gap as far as camera tech is concerned. Both of the cameras come with different body type with the Olympus E-M10 III being a SLR-style mirrorless camera and the Pentax K-S1 being a Mid-size SLR camera.

Before getting through a detailed comparison, below is a brief highlight of how the E-M10 III scores versus the K-S1 in terms of portability, imaging, features and an overall score.

Here is a preview of the gallery images for Olympus OM-D E-M10 Mark III and Pentax K-S1. The complete galleries are available at Olympus E-M10 III Gallery and Pentax K-S1 Gallery.

In case you're looking to carry around your camera regularly, you're going to have to consider its weight and dimensions. The Olympus E-M10 III enjoys outer dimensions of 122mm x 84mm x 50mm (4.8" x 3.3" x 2.0") having a weight of 410 grams (0.90 lbs) while the Pentax K-S1 has dimensions of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") with a weight of 558 grams (1.23 lbs).

Analyze the Olympus E-M10 III vs Pentax K-S1 in the all new Camera and Lens Size Comparison Tool.

Always remember, the weight of an Interchangeable Lens Camera will differ dependant on the lens you have attached during that time. Following is the front view measurements comparison of the E-M10 III compared to the K-S1.

Using size and weight, the portability rating of the E-M10 III and K-S1 is 80 and 69 respectively.

In many cases, it is difficult to envision the difference in sensor sizes simply by going through specifications. The picture below will give you a clearer sense of the sensor dimensions in the E-M10 III and K-S1.

To sum up, the 2 cameras have got different megapixels and different sensor sizes. The E-M10 III because of its smaller sensor will make achieving shallower DOF more difficult and the Pentax K-S1 will produce more detail as a result of its extra 4 Megapixels. Higher resolution can also allow you to crop shots much more aggressively. The newer E-M10 III will have an advantage with regard to sensor innovation.