Olympus E-M1 III vs Pentax K-S1

The following is a complete review of the Olympus E-M1 III vs Pentax K-S1, one is a Pro Mirrorless and the other is a Advanced DSLR by manufacturers Olympus and Pentax. The image resolution of the E-M1 III (20MP) and the K-S1 (20MP) is fairly close but the E-M1 III (Four Thirds) and K-S1 (APS-C) posses different sensor dimensions.

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The E-M1 III was unveiled 5 years after the K-S1 which is a fairly serious gap as far as camera technology is concerned. Both of these cameras have different body design with the Olympus E-M1 III being a SLR-style mirrorless camera and the Pentax K-S1 being a Mid-size SLR camera.

Before we go right into a comprehensive comparison, here is a short introduction of how the E-M1 III matches up vs the K-S1 in terms of portability, imaging, features and an overall mark.

This is a sample of the gallery pictures for Olympus OM-D E-M1 Mark III and Pentax K-S1. The full galleries are viewable at Olympus E-M1 III Gallery and Pentax K-S1 Gallery.

If you're intending to travel with your camera often, you will want to factor its weight and proportions. The Olympus E-M1 III has external dimensions of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") accompanied by a weight of 580 grams (1.28 lbs) and the Pentax K-S1 has measurements of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") along with a weight of 558 grams (1.23 lbs).

Analyze the Olympus E-M1 III vs Pentax K-S1 in the latest Camera and Lens Size Comparison Tool.

Keep in mind, the weight of an Interchangeable Lens Camera will change based on the lens you choose during that time. Following is a front view over all size comparison of the E-M1 III versus the K-S1.

Taking into consideration dimensions and weight, the portability score of the E-M1 III and K-S1 is 67 and 69 respectively.

Sometimes, its tough to picture the gap in sensor dimensions purely by viewing technical specs. The image here might give you a far better sense of the sensor sizes in the E-M1 III and K-S1.

As you have seen, both of these cameras have the same megapixel count but different sensor dimensions. The E-M1 III includes the smaller sensor which is going to make obtaining shallow depth of field harder. The fresher E-M1 III should have an advantage in sensor technology.