Olympus E-M5 II vs Pentax 645D

Lets look closer at the Olympus E-M5 II and Pentax 645D, one being a Advanced Mirrorless and the other is a Pro DSLR by manufacturers Olympus and Pentax. There is a sizeable difference among the sensor resolutions of the E-M5 II (16MP) and 645D (40MP) and the E-M5 II (Four Thirds) and 645D (Medium format) posses totally different sensor sizing.

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The E-M5 II was introduced 4 years later than the 645D and that is a fairly large gap as far as camera tech is concerned. Each of these cameras have different body design with the Olympus E-M5 II being a SLR-style mirrorless camera and the Pentax 645D being a Large SLR camera.

Before diving into a thorough comparison, here is a simple introduction of how the E-M5 II grades against the 645D in the way of portability, imaging, features and an overall grade.

Below is a sample of the gallery pics for Olympus OM-D E-M5 II and Pentax 645D. The whole galleries are viewable at Olympus E-M5 II Gallery and Pentax 645D Gallery.

If you're aiming to lug around your camera regularly, you have to take into account its weight and measurements. The Olympus E-M5 II comes with exterior measurements of 124mm x 85mm x 45mm (4.9" x 3.3" x 1.8") having a weight of 469 grams (1.03 lbs) while the Pentax 645D has proportions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") and a weight of 1480 grams (3.26 lbs).

See the Olympus E-M5 II and Pentax 645D in the new Camera with Lens Size Comparison Tool.

Remember that, the weight of an Interchangeable Lens Camera will change based on the lens you are utilizing at that moment. Below is a front view physical size comparison of the E-M5 II versus the 645D.

Taking into consideration size and weight, the portability rating of the E-M5 II and 645D is 80 and 50 respectively.

Usually, it is very tough to see the gap in sensor measurements just by seeing specs. The graphic below might offer you a much better sense of the sensor sizing in the E-M5 II and 645D.

As you can plainly see, both cameras have different resolutions and different sensor measurements. The E-M5 II using its smaller sensor will make getting shallower DOF more difficult and the Pentax 645D will produce more detail using its extra 24 Megapixels. Greater resolution will let you crop pics a bit more aggressively. The more recent E-M5 II is going to have an advantage when it comes to sensor tech.