Olympus E-M1 II vs Sony A57

Its time to take a more detailed look at the Olympus E-M1 II and Sony A57, one is a Pro Mirrorless and the other is a Entry-Level DSLR by manufacturers Olympus and Sony. There exists a huge gap among the sensor resolutions of the E-M1 II (20MP) and A57 (16MP) and the E-M1 II (Four Thirds) and A57 (APS-C) provide different sensor measurements.

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The E-M1 II was announced 4 years after the A57 which is a fairly significant gap as far as camera technology is concerned. Both the cameras have different body design with the Olympus E-M1 II being a SLR-style mirrorless camera and the Sony A57 being a Compact SLR camera.

Before we go straight to a in depth comparison, here is a concise summation of how the E-M1 II matches up against the A57 in relation to portability, imaging, features and an overall score.

Following is a sample of the gallery pictures for Olympus OM-D E-M1 Mark II and Sony SLT-A57. The whole galleries are provided at Olympus E-M1 II Gallery and Sony A57 Gallery.

For anybody who is planning to carry around your camera, you're going to have to take into account its weight and proportions. The Olympus E-M1 II has physical dimensions of 134mm x 91mm x 67mm (5.3" x 3.6" x 2.6") having a weight of 574 grams (1.27 lbs) while the Sony A57 has measurements of 132mm x 98mm x 81mm (5.2" x 3.9" x 3.2") accompanied by a weight of 618 grams (1.36 lbs).

Look at the Olympus E-M1 II and Sony A57 in the new Camera with Lens Size Comparison Tool.

Do not forget, the weight of an Interchangeable Lens Camera will change depending on the lens you are utilising during that time. Underneath is a front view dimensions comparison of the E-M1 II vs the A57.

Taking into account dimensions and weight, the portability grade of the E-M1 II and A57 is 68 and 64 respectively.

Normally, it can be difficult to visualize the difference in sensor sizes purely by researching technical specs. The picture below may provide you a more clear sense of the sensor sizes in the E-M1 II and A57.

As you have seen, the two cameras provide different megapixel count and different sensor sizes. The E-M1 II having a smaller sensor is going to make achieving shallower DOF trickier and the Olympus E-M1 II will result in more detail with its extra 4MP. Greater resolution will help you crop images more aggressively. The more modern E-M1 II should have a benefit with regard to sensor tech.