Olympus E-M1 III vs Sony A7c

Below, we are contrasting the Olympus E-M1 III vs Sony A7c, former is a Pro Mirrorless while the other is a Advanced Mirrorless by competitors Olympus and Sony. The resolution of the E-M1 III (20MP) and the A7c (24MP) is fairly close but the E-M1 III (Four Thirds) and A7c (Full frame) use totally different sensor dimensions.

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The E-M1 III was announced 7 months before the A7c and they are of a similar age. Both cameras come with different body type with the Olympus E-M1 III being a SLR-style mirrorless camera and the Sony A7c being a Rangefinder-style mirrorless camera.

Before going through a in-depth comparison, below is a simple summation of how the E-M1 III scores against the A7c when considering portability, imaging, features and an overall mark.

The following is a sample of the gallery pictures for Olympus OM-D E-M1 Mark III & Sony Alpha A7c. The whole galleries are viewable at Olympus E-M1 III Gallery & Sony A7c Gallery.

For those who are going to travel with your camera often, you should consider its weight and measurements. The Olympus E-M1 III offers exterior measurements of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") and a weight of 580 grams (1.28 lbs) while the Sony A7c has proportions of 124mm x 71mm x 60mm (4.9" x 2.8" x 2.4") having a weight of 509 grams (1.12 lbs).

Look at the Olympus E-M1 III vs Sony A7c in our completely new Camera plus Lens Size Comparison Tool.

Bear in mind, the weight of an ILC will differ dependant on the lens you are working with at that moment. Here is the front view physical size comparison of the E-M1 III vs the A7c.

Taking into consideration dimensions and weight, the portability grade of the E-M1 III and A7c is 67 and 78 respectively.

More often than not, its hard to visualise the contrast in sensor dimensions simply by looking through a spec sheet. The image below should provide you a more clear sense of the sensor sizing in the E-M1 III and A7c.

As you can see, the 2 cameras posses different resolutions and different sensor dimensions. The E-M1 III with its smaller sensor will make getting shallower depth of field more challenging and the Sony A7c will provide you with more detail with its extra 4 Megapixels. Greater resolution will help you crop images somewhat more aggressively. The more aged E-M1 III will be behind in sensor technology.