Olympus E-M1 vs Pentax K-3

On this page, we will be looking at the Olympus E-M1 versus Pentax K-3, one being a Pro Mirrorless and the latter is a Advanced DSLR by manufacturers Olympus and Pentax. There exists a significant gap between the sensor resolutions of the E-M1 (16MP) and K-3 (24MP) and the E-M1 (Four Thirds) and K-3 (APS-C) boast different sensor dimensions.

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The E-M1 was released 5 months prior to the K-3 and they are both of a similar generation. Both of these cameras have different body design with the Olympus E-M1 being a SLR-style mirrorless camera and the Pentax K-3 being a Mid-size SLR camera.

Before delving into a more detailed comparison, here is a short view of how the E-M1 matches up against the K-3 in relation to portability, imaging, features and an overall rating.

Here is a preview of the gallery images for Olympus OM-D E-M1 and Pentax K-3. The complete galleries are available at Olympus E-M1 Gallery and Pentax K-3 Gallery.

In case you're aiming to carry your camera often, you are going to need to factor in its weight and size. The Olympus E-M1 comes with outer measurements of 130mm x 94mm x 63mm (5.1" x 3.7" x 2.5") having a weight of 497 grams (1.10 lbs) whilst the Pentax K-3 has specifications of 131mm x 100mm x 77mm (5.2" x 3.9" x 3.0") with a weight of 800 grams (1.76 lbs).

Contrast the Olympus E-M1 versus Pentax K-3 in the latest Camera and Lens Size Comparison Tool.

Keep in mind, the weight of an Interchangeable Lens Camera will change depending on the lens you use at that time. Following is a front view scale comparison of the E-M1 and the K-3.

Taking into account dimensions and weight, the portability grade of the E-M1 and K-3 is 71 and 59 respectively.

More often than not, it is very tough to imagine the gap between sensor sizing only by checking specs. The photograph below might provide you a more clear sense of the sensor sizing in the E-M1 and K-3.

All in all, both of the cameras have different resolutions and different sensor sizing. The E-M1 featuring a tinier sensor is going to make shooting bokeh tougher and the Pentax K-3 will give extra detail as a result of its extra 8MP. Higher resolution will enable you to crop photographs a bit more aggressively.