Olympus E-M5 vs Pentax K-3

Lets look more closely at the Olympus E-M5 and Pentax K-3, former is a Advanced Mirrorless while the other is a Advanced DSLR by manufacturers Olympus and Pentax. There is a large difference between the sensor resolutions of the E-M5 (16MP) and K-3 (24MP) and the E-M5 (Four Thirds) and K-3 (APS-C) posses totally different sensor size.

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The E-M5 was announced 23 months prior to the K-3 making them a generation away from each other. Each of the cameras feature different body design with the Olympus E-M5 being a SLR-style mirrorless camera and the Pentax K-3 being a Mid-size SLR camera.

Before we go straight to a full comparison, here is a simple overview of how the E-M5 scores against the K-3 in regards to portability, imaging, features and an overall mark.

Here is a sample of the gallery pictures for Olympus OM-D E-M5 & Pentax K-3. The whole galleries are available at Olympus E-M5 Gallery & Pentax K-3 Gallery.

If you're going to travel with your camera frequently, you're going to have to consider its weight and volume. The Olympus E-M5 has physical dimensions of 122mm x 89mm x 43mm (4.8" x 3.5" x 1.7") along with a weight of 425 grams (0.94 lbs) while the Pentax K-3 has sizing of 131mm x 100mm x 77mm (5.2" x 3.9" x 3.0") and a weight of 800 grams (1.76 lbs).

Look at the Olympus E-M5 and Pentax K-3 in our brand new Camera plus Lens Size Comparison Tool.

Do not forget, the weight of an ILC will vary depending on the lens you are using at that time. Following is a front view dimension comparison of the E-M5 vs the K-3.

Taking into account size and weight, the portability rating of the E-M5 and K-3 is 81 and 59 respectively.

Often, it is tough to envision the contrast between sensor dimensions just by looking at a spec sheet. The picture below will provide you a much better sense of the sensor sizes in the E-M5 and K-3.

As you can see, both of the cameras feature different megapixel count and different sensor dimensions. The E-M5 using its tinier sensor will make achieving shallower DOF tougher and the Pentax K-3 will resolve extra detail with its extra 8 Megapixels. Greater resolution will make it easier to crop pics way more aggressively. The more aged E-M5 is going to be disadvantaged when it comes to sensor technology.