Olympus PEN-F vs Pentax K-S1

In this write-up, we are reviewing the Olympus PEN-F versus Pentax K-S1, one is a Advanced Mirrorless and the other is a Advanced DSLR by brands Olympus and Pentax. The resolution of the PEN-F (20MP) and the K-S1 (20MP) is very well matched but the PEN-F (Four Thirds) and K-S1 (APS-C) come with totally different sensor sizing.

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The PEN-F was revealed 18 months after the K-S1 making the cameras a generation away from one another. Both cameras offer different body type with the Olympus PEN-F being a Rangefinder-style mirrorless camera and the Pentax K-S1 being a Mid-size SLR camera.

Before getting straight into a step-by-step comparison, below is a short synopsis of how the PEN-F matches up vs the K-S1 with regard to portability, imaging, features and an overall score.

Here is a sample of the gallery pics for Olympus PEN-F and Pentax K-S1. The full galleries are provided at Olympus PEN-F Gallery and Pentax K-S1 Gallery.

For anyone who is looking to carry around your camera frequently, you will want to take into account its weight and volume. The Olympus PEN-F enjoys outer dimensions of 125mm x 72mm x 37mm (4.9" x 2.8" x 1.5") with a weight of 427 grams (0.94 lbs) and the Pentax K-S1 has sizing of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") accompanied by a weight of 558 grams (1.23 lbs).

Look at the Olympus PEN-F versus Pentax K-S1 in the latest Camera with Lens Size Comparison Tool.

Always remember, the weight of an Interchangeable Lens Camera will vary based on the lens you are utilizing at that moment. Here is the front view size comparison of the PEN-F compared to the K-S1.

Considering dimensions and weight, the portability score of the PEN-F and K-S1 is 84 and 69 respectively.

More often than not, it's difficult to see the difference between sensor sizes only by reading through specs. The picture here should give you a clearer sense of the sensor dimensions in the PEN-F and K-S1.

As you can plainly see, both cameras enjoy the same exact megapixels but not the same sensor sizes. The PEN-F provides the tinier sensor which is going to make obtaining shallower DOF harder. The more recent PEN-F is going to have an advantage when it comes to sensor innovation.