Olympus E-M10 III vs Pentax 645D

On this page, we are evaluating the Olympus E-M10 III and Pentax 645D, 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 image resolutions of the E-M10 III (16MP) and 645D (40MP) and the E-M10 III (Four Thirds) and 645D (Medium format) have different sensor sizes.

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The E-M10 III was unveiled 7 years later than the 645D and that is a fairly sizable gap as far as camera technology is concerned. Both the cameras have different body design with the Olympus E-M10 III being a SLR-style mirrorless camera and the Pentax 645D being a Large SLR camera.

Before delving into a full comparison, here is a simple introduction of how the E-M10 III scores versus the 645D in relation to portability, imaging, features and an overall rating.

The following is a sample of the gallery pics for Olympus OM-D E-M10 Mark III and Pentax 645D. The full galleries are available at Olympus E-M10 III Gallery and Pentax 645D Gallery.

For those who are going to carry your camera regularly, you'll need to think about its weight and volume. The Olympus E-M10 III enjoys outside measurements of 122mm x 84mm x 50mm (4.8" x 3.3" x 2.0") accompanied by a weight of 410 grams (0.90 lbs) whilst the Pentax 645D has sizing of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") accompanied by a weight of 1480 grams (3.26 lbs).

Check out the Olympus E-M10 III and Pentax 645D in the new Camera and Lens Size Comparison Tool.

Don't forget, the weight of an Interchangeable Lens Camera will change dependant on the lens you have attached during that time. Below is a front view measurements comparison of the E-M10 III compared to the 645D.

Using dimensions and weight, the portability rating of the E-M10 III and 645D is 80 and 50 respectively.

Normally, its difficult to imagine the gap in sensor sizing purely by looking through technical specs. The photograph here may offer you a greater sense of the sensor measurements in the E-M10 III and 645D.

As you can tell, the 2 cameras have different resolutions and different sensor sizing. The E-M10 III with its smaller sensor is going to make achieving bokeh more challenging and the Pentax 645D will provide you with more detail having an extra 24 Megapixels. Greater resolution will help you crop pics a bit more aggressively. The newer E-M10 III should have a benefit with regard to sensor technology.