Olympus E-M1 III vs Sony A7R III

Here is a extended comparison of the Olympus E-M1 III and Sony A7R III, both Pro Mirrorless cameras by competitors Olympus and Sony. There is a crucial difference among the sensor resolutions of the E-M1 III (20MP) and A7R III (42MP) and the E-M1 III (Four Thirds) and A7R III (Full frame) offer totally different sensor sizes.

Photography Glossary

The E-M1 III was unveiled 2 years later than the A7R III and that is a fairly serious gap as far as camera tech is concerned. Each of these cameras have the same body design (SLR-style mirrorless).

Before diving straight to a detailed comparison, here is a simple highlight of how the E-M1 III matches up vs the A7R III in terms of portability, imaging, features and an overall rating.

The following is a preview of the gallery photos for Olympus OM-D E-M1 Mark III and Sony Alpha A7R III. The full galleries are provided at Olympus E-M1 III Gallery and Sony A7R III Gallery.

If you're looking to carry your camera regularly, you will have to take into account its weight and measurements. The Olympus E-M1 III features outer dimensions of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") along with a weight of 580 grams (1.28 lbs) whilst the Sony A7R III has proportions of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") along with a weight of 657 grams (1.45 lbs).

Contrast the Olympus E-M1 III and Sony A7R III in the all new Camera with Lens Size Comparison Tool.

Remember that, the weight of an Interchangeable Lens Camera will vary dependant on the lens you are utilising during that time. Below is a front view sizing comparison of the E-M1 III compared to the A7R III.

Factoring in size and weight, the portability rating of the E-M1 III and A7R III is 67 and 63 respectively.

Usually, it's tough to envision the contrast in sensor sizing merely by looking through technical specs. The photograph underneath will provide you a far better sense of the sensor sizes in the E-M1 III and A7R III.

As you can tell, both of the cameras have different megapixel count and different sensor sizing. The E-M1 III having a smaller sensor will make achieving bokeh trickier and the Sony A7R III will render greater detail having an extra 22MP. Higher resolution can also enable you to crop pictures a bit more aggressively. The newer E-M1 III will have a benefit with regard to sensor innovation.