Olympus E-M1 III vs Sony a1

Below, we will be looking at the Olympus E-M1 III vs Sony a1, both Pro Mirrorless digital cameras by companies Olympus and Sony. There is a big difference between the image resolutions of the E-M1 III (20MP) and a1 (50MP) and the E-M1 III (Four Thirds) and a1 (Full frame) enjoy totally different sensor sizes.

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The E-M1 III was unveiled 11 months prior to the a1 which means that they are both of a similar generation. Both of these cameras come with the identical body type (SLR-style mirrorless).

Before delving in to a full comparison, below is a short summation of how the E-M1 III grades versus the a1 when it comes to portability, imaging, features and an overall rating.

The following is a preview of the gallery images for Olympus OM-D E-M1 Mark III and Sony Alpha a1. The full galleries are viewable at Olympus E-M1 III Gallery and Sony a1 Gallery.

When you are going to carry your camera, you'll have to factor in its weight and volume. The Olympus E-M1 III comes with physical dimensions of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") along with a weight of 580 grams (1.28 lbs) whilst the Sony a1 has sizing of 129mm x 97mm x 70mm (5.1" x 3.8" x 2.8") along with a weight of 737 grams (1.62 lbs).

See the Olympus E-M1 III vs Sony a1 in the new Camera with Lens Size Comparison Tool.

Keep in mind, the weight of an Interchangeable Lens Camera will change dependant on the lens you select at the time. Following is the front view dimensions comparison of the E-M1 III vs the a1.

Taking into account size and weight, the portability rating of the E-M1 III and a1 is 67 and 61 respectively.

Often, it's difficult to visualise the difference between sensor sizing simply by checking specifications. The photograph below will give you a far better sense of the sensor sizes in the E-M1 III and a1.

To sum up, the 2 cameras have got different megapixel count and different sensor sizing. The E-M1 III using its tinier sensor will make getting shallower DOF trickier and the Sony a1 will give more detail having an extra 30MP. Higher resolution can also help you crop photographs much more aggressively. The older E-M1 III is going to be disadvantaged in sensor innovation.