Olympus E-M1 III vs Sony A7 III

The following is a detailed review of the Olympus E-M1 III vs Sony A7 III, both Pro Mirrorless digital cameras by competitors Olympus and Sony. The resolution of the E-M1 III (20MP) and the A7 III (24MP) is fairly similar but the E-M1 III (Four Thirds) and A7 III (Full frame) boast different sensor size.

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The E-M1 III was unveiled 24 months after the A7 III making them a generation away from each other. Both of these cameras feature the same body design (SLR-style mirrorless).

Before we go straight to a step-by-step comparison, here is a concise view of how the E-M1 III grades against the A7 III when it comes to portability, imaging, features and an overall mark.

The following is a sample of the gallery pictures for Olympus OM-D E-M1 Mark III and Sony Alpha A7 III. The full galleries are viewable at Olympus E-M1 III Gallery and Sony A7 III Gallery.

For anybody who is going to travel with your camera often, you have to think about its weight and volume. The Olympus E-M1 III has outer measurements of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") accompanied by a weight of 580 grams (1.28 lbs) while the Sony A7 III has sizing of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") with a weight of 650 grams (1.43 lbs).

Examine the Olympus E-M1 III vs Sony A7 III in the new Camera and Lens Size Comparison Tool.

Keep in mind, the weight of an Interchangeable Lens Camera will vary depending on the lens you have at that moment. The following is a front view sizing comparison of the E-M1 III and the A7 III.

Taking into consideration size and weight, the portability grade of the E-M1 III and A7 III is 67 and 63 respectively.

In many cases, it's tough to visualize the contrast between sensor dimensions just by reading technical specs. The pic here may give you a stronger sense of the sensor sizing in the E-M1 III and A7 III.

As you have seen, both cameras feature different resolutions and different sensor dimensions. The E-M1 III using its tinier sensor is going to make achieving shallower depth of field more challenging and the Sony A7 III will deliver more detail having an extra 4MP. Greater resolution can also allow you to crop images way more aggressively. The newer E-M1 III provides an advantage with regard to sensor tech.