Olympus E-P5 vs Pentax K-S1

In this article, we will be evaluating the Olympus E-P5 versus Pentax K-S1, one being a Entry-Level Mirrorless and the latter is a Advanced DSLR by rivals Olympus and Pentax. The resolution of the E-P5 (16MP) and the K-S1 (20MP) is pretty comparable but the E-P5 (Four Thirds) and K-S1 (APS-C) feature different sensor sizes.

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The E-P5 was announced 10 months earlier than the K-S1 which means that they are both of a similar generation. Each of these cameras offer different body type with the Olympus E-P5 being a Rangefinder-style mirrorless camera and the Pentax K-S1 being a Mid-size SLR camera.

Before diving in to a comprehensive comparison, below is a short highlight of how the E-P5 matches up vs the K-S1 with regard to portability, imaging, features and an overall rating.

Below is a preview of the gallery images for Olympus PEN E-P5 and Pentax K-S1. The whole galleries are provided at Olympus E-P5 Gallery and Pentax K-S1 Gallery.

For those who are going to carry your camera regularly, you'll have to think about its weight and volume. The Olympus E-P5 provides exterior measurements of 122mm x 69mm x 37mm (4.8" x 2.7" x 1.5") with a weight of 420 grams (0.93 lbs) and the Pentax K-S1 has sizing of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") along with a weight of 558 grams (1.23 lbs).

Examine the Olympus E-P5 versus Pentax K-S1 in the latest Camera and Lens Size Comparison Tool.

Don't forget, the weight of an Interchangeable Lens Camera will vary depending on the lens you choose at that moment. Below is the front view dimensions comparison of the E-P5 and the K-S1.

Considering size and weight, the portability score of the E-P5 and K-S1 is 85 and 69 respectively.

Oftentimes, it can be tough to picture the contrast in sensor sizing merely by seeing specifications. The photograph below should give you a more clear sense of the sensor sizing in the E-P5 and K-S1.

To sum up, each of the cameras offer different megapixel count and different sensor sizing. The E-P5 using its smaller sensor is going to make shooting bokeh more challenging and the Pentax K-S1 will provide more detail with its extra 4MP. Higher resolution will let you crop photographs a little more aggressively. The older E-P5 will be behind in sensor technology.