Olympus E-M5 III vs Sony A7S

Here is a in-depth review of the Olympus E-M5 III vs Sony A7S, former being a Advanced Mirrorless while the latter is a Pro Mirrorless by competitors Olympus and Sony. There exists a large gap among the image resolutions of the E-M5 III (20MP) and A7S (12MP) and the E-M5 III (Four Thirds) and A7S (Full frame) possess totally different sensor dimensions.

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The E-M5 III was brought out 5 years later than the A7S and that is a fairly serious difference as far as camera technology is concerned. The two cameras come with the identical body type (SLR-style mirrorless).

Before delving straight into a thorough comparison, below is a short highlight of how the E-M5 III grades versus the A7S in terms of portability, imaging, features and an overall rating.

Here is a preview of the gallery photos for Olympus OM-D E-M5 III & Sony Alpha A7S. The entire galleries are viewable at Olympus E-M5 III Gallery & Sony A7S Gallery.

For anybody who is planning to carry your camera regularly, you have to take into account its weight and dimensions. The Olympus E-M5 III offers physical dimensions of 125mm x 85mm x 50mm (4.9" x 3.3" x 2.0") accompanied by a weight of 414 grams (0.91 lbs) and the Sony A7S has dimensions of 127mm x 94mm x 48mm (5.0" x 3.7" x 1.9") having a weight of 489 grams (1.08 lbs).

Analyze the Olympus E-M5 III vs Sony A7S in our brand new Camera plus Lens Size Comparison Tool.

Always remember, the weight of an ILC will vary based on the lens you have at that time. Here is the front view measurement comparison of the E-M5 III vs the A7S.

Taking into consideration dimensions and weight, the portability rating of the E-M5 III and A7S is 80 and 77 respectively.

Sometimes, it is difficult to see the difference in sensor sizing simply by going through a spec sheet. The graphic here may give you a clearer sense of the sensor dimensions in the E-M5 III and A7S.

Clearly, both the cameras have got different megapixel count and different sensor sizing. The E-M5 III due to its smaller sensor will make achieving shallower depth of field more challenging and the Olympus E-M5 III will show greater detail having its extra 8MP. Higher resolution will help you crop photographs much more aggressively. The fresher E-M5 III is going to have a benefit with regard to sensor tech.