Olympus E-M1 vs Sony A7S

Below is a extensive overview of the Olympus E-M1 and Sony A7S, both Pro Mirrorless digital cameras by brands Olympus and Sony. There exists a crucial gap between the sensor resolutions of the E-M1 (16MP) and A7S (12MP) and the E-M1 (Four Thirds) and A7S (Full frame) feature different sensor dimensions.

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The E-M1 was brought out 5 months prior to the A7S and they are both of a similar generation. Each of the cameras offer the identical body type (SLR-style mirrorless).

Before going in to a step-by-step comparison, below is a brief synopsis of how the E-M1 scores against the A7S when it comes to portability, imaging, features and an overall grade.

Following is a preview of the gallery images for Olympus OM-D E-M1 and Sony Alpha A7S. The entire galleries are viewable at Olympus E-M1 Gallery and Sony A7S Gallery.

If you are aiming to lug around your camera, you need to factor in its weight and volume. The Olympus E-M1 offers physical measurements of 130mm x 94mm x 63mm (5.1" x 3.7" x 2.5") with a weight of 497 grams (1.10 lbs) and the Sony A7S has sizing of 127mm x 94mm x 48mm (5.0" x 3.7" x 1.9") along with a weight of 489 grams (1.08 lbs).

Take a look at the Olympus E-M1 and Sony A7S in the latest Camera and Lens Size Comparison Tool.

Remember that, the weight of an Interchangeable Lens Camera will vary based on the lens you are utilising at the time. Here is the front view overall size comparison of the E-M1 versus the A7S.

Using dimensions and weight, the portability score of the E-M1 and A7S is 71 and 77 respectively.

Quite often, it is difficult to picture the contrast between sensor measurements merely by checking specs. The photograph here will provide you a better sense of the sensor measurements in the E-M1 and A7S.

As you can plainly see, the 2 cameras enjoy different resolutions and different sensor measurements. The E-M1 because of its tinier sensor is going to make getting shallow DOF harder and the Olympus E-M1 will give you greater detail having its extra 4MP. Higher resolution will also make it easier to crop shots far more aggressively.