Olympus E-M10 IV vs Pentax 645Z

Here is a thorough overview of the Olympus E-M10 IV versus Pentax 645Z, one being a Entry-Level Mirrorless and the other is a Pro DSLR by manufacturers Olympus and Pentax. There exists a significant gap among the resolutions of the E-M10 IV (20MP) and 645Z (51MP) and the E-M10 IV (Four Thirds) and 645Z (Medium format) enjoy totally different sensor sizes.

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The E-M10 IV was brought out 6 years later than the 645Z and that is a fairly sizable gap as far as camera technology is concerned. Each of the cameras offer different body type with the Olympus E-M10 IV being a SLR-style mirrorless camera and the Pentax 645Z being a Large SLR camera.

Before diving straight into a comprehensive comparison, below is a simple overview of how the E-M10 IV matches up versus the 645Z in relation to portability, imaging, features and an overall rating.

Here is a sample of the gallery pictures for Olympus OM-D E-M10 IV and Pentax 645Z. The entire galleries are viewable at Olympus E-M10 IV Gallery and Pentax 645Z Gallery.

In case you're going to carry your camera often, you're going to have to factor in its weight and volume. The Olympus E-M10 IV has physical dimensions of 122mm x 84mm x 49mm (4.8" x 3.3" x 1.9") and a weight of 383 grams (0.84 lbs) while the Pentax 645Z has sizing of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") along with a weight of 1550 grams (3.42 lbs).

Contrast the Olympus E-M10 IV versus Pentax 645Z in the latest Camera and Lens Size Comparison Tool.

Don't forget, the weight of an Interchangeable Lens Camera will vary depending on the lens you are employing during that time. The following is the front view measurements comparison of the E-M10 IV vs the 645Z.

Taking into account dimensions and weight, the portability score of the E-M10 IV and 645Z is 81 and 49 respectively.

Sometimes, it is tough to see the contrast in sensor sizing purely by checking out technical specs. The visual below should offer you a clearer sense of the sensor sizes in the E-M10 IV and 645Z.

As you have seen, both of these cameras offer different megapixel count and different sensor sizing. The E-M10 IV due to its smaller sensor will make achieving bokeh tougher and the Pentax 645Z will show extra detail having its extra 31MP. Greater resolution will enable you to crop images a little more aggressively. The fresher E-M10 IV is going to have a benefit in sensor tech.