Olympus E-M10 III vs Sony A7S

Its time to look a bit more closely at the Olympus E-M10 III versus Sony A7S, former being a Entry-Level Mirrorless while the latter is a Pro Mirrorless by competitors Olympus and Sony. There exists a large gap between the resolutions of the E-M10 III (16MP) and A7S (12MP) and the E-M10 III (Four Thirds) and A7S (Full frame) boast different sensor dimensions.

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The E-M10 III was brought out 3 years later than the A7S and that is quite a serious difference as far as technology is concerned. Each of these cameras have the same body design (SLR-style mirrorless).

Before diving into a detailed comparison, here is a simple summation of how the E-M10 III scores versus the A7S in relation to portability, imaging, features and an overall grade.

Below is a preview of the gallery photos for Olympus OM-D E-M10 Mark III & Sony Alpha A7S. The entire galleries are viewable at Olympus E-M10 III Gallery & Sony A7S Gallery.

If you are planning to lug around your camera often, you need to factor its weight and proportions. The Olympus E-M10 III has outer measurements of 122mm x 84mm x 50mm (4.8" x 3.3" x 2.0") with a weight of 410 grams (0.90 lbs) while the Sony A7S has measurements of 127mm x 94mm x 48mm (5.0" x 3.7" x 1.9") accompanied by a weight of 489 grams (1.08 lbs).

Examine the Olympus E-M10 III versus Sony A7S in our newest Camera plus Lens Size Comparison Tool.

Take into consideration, the weight of an ILC will vary depending on the lens you select at that time. Below is a front view physical size comparison of the E-M10 III versus the A7S.

Considering dimensions and weight, the portability score of the E-M10 III and A7S is 80 and 77 respectively.

Quite often, it's hard to picture the gap between sensor measurements simply by looking at technical specs. The visual below will help provide you a far better sense of the sensor measurements in the E-M10 III and A7S.

As you have seen, the two cameras provide different megapixel count and different sensor measurements. The E-M10 III featuring a tinier sensor is going to make achieving shallower depth of field more difficult and the Olympus E-M10 III will resolve greater detail having its extra 4 Megapixels. Higher resolution can also enable you to crop pictures more aggressively. The more modern E-M10 III should have an advantage when it comes to sensor technology.