Olympus E-P1 vs Pentax K-S1

Lets look a bit more closely at the Olympus E-P1 versus Pentax K-S1, one is a Entry-Level Mirrorless and the latter is a Advanced DSLR by brands Olympus and Pentax. There is a significant difference between the resolutions of the E-P1 (12MP) and K-S1 (20MP) and the E-P1 (Four Thirds) and K-S1 (APS-C) provide totally different sensor size.

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The E-P1 was brought out 6 years prior to the K-S1 which is quite a sizable gap as far as tech is concerned. Both cameras have different body design with the Olympus E-P1 being a Rangefinder-style mirrorless camera and the Pentax K-S1 being a Mid-size SLR camera.

Before getting into a step-by-step comparison, here is a quick highlight of how the E-P1 grades versus the K-S1 in relation to portability, imaging, features and an overall score.

The following is a preview of the gallery images for Olympus PEN E-P1 and Pentax K-S1. The entire galleries are provided at Olympus E-P1 Gallery and Pentax K-S1 Gallery.

For anyone who is going to carry around your camera, you have to factor in its weight and measurements. The Olympus E-P1 provides exterior dimensions of 121mm x 70mm x 36mm (4.8" x 2.8" x 1.4") with a weight of 355 grams (0.78 lbs) whilst the Pentax K-S1 has proportions of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") having a weight of 558 grams (1.23 lbs).

Look at the Olympus E-P1 versus Pentax K-S1 in the all new Camera with Lens Size Comparison Tool.

Don't forget, the weight of an Interchangeable Lens Camera will vary dependant on the lens you have chosen at that time. Following is a front view physical size comparison of the E-P1 against the K-S1.

Considering size and weight, the portability grade of the E-P1 and K-S1 is 86 and 69 respectively.

Usually, its difficult to envision the gap between sensor sizes only by checking specs. The picture here will offer you a better sense of the sensor sizes in the E-P1 and K-S1.

All in all, both of the cameras provide different resolutions and different sensor sizes. The E-P1 featuring a tinier sensor will make achieving bokeh trickier and the Pentax K-S1 will give greater detail having its extra 8 Megapixels. Higher resolution will also help you crop shots more aggressively. The more aged E-P1 is going to be behind when it comes to sensor innovation.