Olympus E-M5 II vs Pentax 645Z

Let's look much closer at the Olympus E-M5 II and Pentax 645Z, former being a Advanced Mirrorless while the other is a Pro DSLR by manufacturers Olympus and Pentax. There exists a sizable gap between the image resolutions of the E-M5 II (16MP) and 645Z (51MP) and the E-M5 II (Four Thirds) and 645Z (Medium format) boast totally different sensor dimensions.

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The E-M5 II was unveiled 10 months later than the 645Z and they are both of a similar age. Both the cameras have different body design with the Olympus E-M5 II being a SLR-style mirrorless camera and the Pentax 645Z being a Large SLR camera.

Before diving into a in depth comparison, here is a short summary of how the E-M5 II matches up versus the 645Z with regard to portability, imaging, features and an overall rating.

This is a sample of the gallery pictures for Olympus OM-D E-M5 II & Pentax 645Z. The full galleries are available at Olympus E-M5 II Gallery & Pentax 645Z Gallery.

When you are looking to carry your camera regularly, you have to consider its weight and measurements. The Olympus E-M5 II enjoys external dimensions of 124mm x 85mm x 45mm (4.9" x 3.3" x 1.8") accompanied by a weight of 469 grams (1.03 lbs) while the Pentax 645Z has proportions of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") and a weight of 1550 grams (3.42 lbs).

Check out the Olympus E-M5 II and Pentax 645Z in our newest Camera plus Lens Size Comparison Tool.

Bear in mind, the weight of an ILC will differ dependant on the lens you select at the time. Following is a front view proportions comparison of the E-M5 II compared to the 645Z.

Using dimensions and weight, the portability rating of the E-M5 II and 645Z is 80 and 49 respectively.

Sometimes, it can be difficult to see the difference between sensor sizing simply by checking technical specs. The graphic underneath might give you a stronger sense of the sensor dimensions in the E-M5 II and 645Z.

As you can tell, each of these cameras have different megapixels and different sensor sizing. The E-M5 II with its tinier sensor will make shooting shallow DOF trickier and the Pentax 645Z will resolve extra detail having an extra 35MP. Greater resolution will allow you to crop pics a bit more aggressively. The more modern E-M5 II will have an advantage with regard to sensor technology.