Olympus E-M1 vs Pentax 645D

Its time to look a bit more closely at the Olympus E-M1 vs Pentax 645D, one is a Pro Mirrorless and the latter is a Pro DSLR by competitors Olympus and Pentax. There exists a sizeable gap between the resolutions of the E-M1 (16MP) and 645D (40MP) and the E-M1 (Four Thirds) and 645D (Medium format) possess different sensor sizing.

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The E-M1 was revealed 3 years after the 645D which is quite a large gap as far as technology is concerned. Each of these cameras offer different body type with the Olympus E-M1 being a SLR-style mirrorless camera and the Pentax 645D being a Large SLR camera.

Before delving straight into a step-by-step comparison, below is a short introduction of how the E-M1 scores vs the 645D with regards to portability, imaging, features and an overall score.

Here is a preview of the gallery images for Olympus OM-D E-M1 and Pentax 645D. The full galleries are available at Olympus E-M1 Gallery and Pentax 645D Gallery.

For anybody who is going to carry around your camera, you're going to have to think about its weight and dimensions. The Olympus E-M1 features external measurements of 130mm x 94mm x 63mm (5.1" x 3.7" x 2.5") having a weight of 497 grams (1.10 lbs) whilst the Pentax 645D has dimensions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") and a weight of 1480 grams (3.26 lbs).

Check the Olympus E-M1 vs Pentax 645D in the all new Camera with Lens Size Comparison Tool.

Bear in mind, the weight of an Interchangeable Lens Camera will change based on the lens you have attached during that time. The following is the front view scale comparison of the E-M1 versus the 645D.

Taking into account dimensions and weight, the portability rating of the E-M1 and 645D is 71 and 50 respectively.

Typically, it's tough to imagine the gap between sensor sizes merely by going over a spec sheet. The picture underneath will help offer you a more clear sense of the sensor measurements in the E-M1 and 645D.

Clearly, both of these cameras offer different megapixel count and different sensor sizes. The E-M1 using its tinier sensor is going to make shooting shallower DOF more challenging and the Pentax 645D will deliver extra detail because of its extra 24MP. Higher resolution will also let you crop photographs a little more aggressively. The fresher E-M1 provides an edge with regard to sensor innovation.