Olympus E-M5 vs Sony A7S

On this page, we are reviewing the Olympus E-M5 vs Sony A7S, one is a Advanced Mirrorless and the other is a Pro Mirrorless by manufacturers Olympus and Sony. There exists a crucial gap between the image resolutions of the E-M5 (16MP) and A7S (12MP) and the E-M5 (Four Thirds) and A7S (Full frame) offer totally different sensor sizing.

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The E-M5 was unveiled 23 months before the A7S making them a generation away from one another. Both of these cameras have the same body design (SLR-style mirrorless).

Before going right into a step-by-step comparison, here is a concise summary of how the E-M5 matches up versus the A7S with respect to portability, imaging, features and an overall mark.

This is a sample of the gallery pictures for Olympus OM-D E-M5 and Sony Alpha A7S. The full galleries are provided at Olympus E-M5 Gallery and Sony A7S Gallery.

For anyone who is going to travel with your camera often, you will have to take into account its weight and volume. The Olympus E-M5 features exterior dimensions of 122mm x 89mm x 43mm (4.8" x 3.5" x 1.7") and a weight of 425 grams (0.94 lbs) whilst the Sony A7S has sizing of 127mm x 94mm x 48mm (5.0" x 3.7" x 1.9") and a weight of 489 grams (1.08 lbs).

Check the Olympus E-M5 vs Sony A7S in the all new Camera and Lens Size Comparison Tool.

Always remember, the weight of an Interchangeable Lens Camera will change depending on the lens you choose at that time. Underneath is a front view physical size comparison of the E-M5 vs the A7S.

Considering dimensions and weight, the portability score of the E-M5 and A7S is 81 and 77 respectively.

More often than not, it can be tough to visualise the difference between sensor dimensions purely by reading through specs. The picture below might offer you a better sense of the sensor sizes in the E-M5 and A7S.

As you can plainly see, the 2 cameras have different megapixels and different sensor dimensions. The E-M5 having a tinier sensor will make getting shallow DOF trickier and the Olympus E-M5 will resolve extra detail having an extra 4 Megapixels. Greater resolution can also allow you to crop images a bit more aggressively. The more aged E-M5 is going to be behind with regard to sensor innovation.