Olympus E-M1 vs Sony A7c

Below is a thorough overview of the Olympus E-M1 versus Sony A7c, former being a Pro Mirrorless while the latter is a Advanced Mirrorless by brands Olympus and Sony. There is a sizable difference between the image resolutions of the E-M1 (16MP) and A7c (24MP) and the E-M1 (Four Thirds) and A7c (Full frame) boast totally different sensor measurements.

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The E-M1 was introduced 7 years before the A7c and that is quite a significant difference as far as tech is concerned. Both cameras have different body design with the Olympus E-M1 being a SLR-style mirrorless camera and the Sony A7c being a Rangefinder-style mirrorless camera.

Before diving into a complete comparison, here is a quick view of how the E-M1 matches up vs the A7c in terms of portability, imaging, features and an overall grade.

Below is a preview of the gallery photos for Olympus OM-D E-M1 & Sony Alpha A7c. The whole galleries are available at Olympus E-M1 Gallery & Sony A7c Gallery.

In case you're aiming to lug around your camera, you will have to consider its weight and dimensions. The Olympus E-M1 has got external dimensions of 130mm x 94mm x 63mm (5.1" x 3.7" x 2.5") having a weight of 497 grams (1.10 lbs) and the Sony A7c has dimensions of 124mm x 71mm x 60mm (4.9" x 2.8" x 2.4") and a weight of 509 grams (1.12 lbs).

Check the Olympus E-M1 versus Sony A7c in our completely new Camera & Lens Size Comparison Tool.

Remember that, the weight of an ILC will differ based on the lens you are employing at that time. The following is a front view measurement comparison of the E-M1 and the A7c.

Considering size and weight, the portability grade of the E-M1 and A7c is 71 and 78 respectively.

Usually, it is difficult to envision the gap between sensor measurements merely by reading technical specs. The photograph underneath should offer you a more clear sense of the sensor sizes in the E-M1 and A7c.

As you have seen, each of the cameras provide different megapixels and different sensor measurements. The E-M1 using its tinier sensor will make achieving shallower DOF more difficult and the Sony A7c will deliver extra detail using its extra 8MP. Higher resolution will allow you to crop shots more aggressively. The older E-M1 is going to be disadvantaged in sensor tech.