Olympus E-M1 III vs Sony A6100

On this page, we are reviewing the Olympus E-M1 III and Sony A6100, one being a Pro Mirrorless and the other is a Advanced Mirrorless by competitors Olympus and Sony. The sensor resolution of the E-M1 III (20MP) and the A6100 (24MP) is fairly similar but the E-M1 III (Four Thirds) and A6100 (APS-C) have totally different sensor sizes.

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The E-M1 III was announced 6 months later than the A6100 which means that they are both of a similar generation. Each of the cameras have different body design with the Olympus E-M1 III being a SLR-style mirrorless camera and the Sony A6100 being a Rangefinder-style mirrorless camera.

Before we go straight to a step-by-step comparison, here is a quick highlight of how the E-M1 III scores versus the A6100 in regards to portability, imaging, features and an overall grade.

Following is a sample of the gallery pictures for Olympus OM-D E-M1 Mark III and Sony Alpha a6100. The whole galleries are available at Olympus E-M1 III Gallery and Sony A6100 Gallery.

When you are intending to lug around your camera often, you will want to consider its weight and dimensions. The Olympus E-M1 III enjoys outside dimensions of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") accompanied by a weight of 580 grams (1.28 lbs) and the Sony A6100 has dimensions of 120mm x 67mm x 59mm (4.7" x 2.6" x 2.3") along with a weight of 396 grams (0.87 lbs).

Compare the Olympus E-M1 III and Sony A6100 in the latest Camera and Lens Size Comparison Tool.

Don't forget, the weight of an Interchangeable Lens Camera will change depending on the lens you are using during that time. Following is a front view dimensions comparison of the E-M1 III and the A6100.

Factoring in size and weight, the portability grade of the E-M1 III and A6100 is 67 and 81 respectively.

Usually, it's hard to visualise the gap between sensor measurements only by reviewing specifications. The photograph here should offer you a greater sense of the sensor dimensions in the E-M1 III and A6100.

To sum up, each of the cameras provide different resolutions and different sensor measurements. The E-M1 III using its tinier sensor will make shooting shallow depth of field harder and the Sony A6100 will deliver greater detail with its extra 4 Megapixels. Greater resolution will also make it easier to crop images more aggressively.