Olympus E-M1 vs Sony A77

Its time to look a little more closely at the Olympus E-M1 and Sony A77, one is a Pro Mirrorless and the other is a Advanced DSLR by competitors Olympus and Sony. There is a significant difference between the image resolutions of the E-M1 (16MP) and A77 (24MP) and the E-M1 (Four Thirds) and A77 (APS-C) provide different sensor sizes.

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The E-M1 was launched 2 years after the A77 which is quite a sizable gap as far as tech is concerned. Each of the cameras have different body design with the Olympus E-M1 being a SLR-style mirrorless camera and the Sony A77 being a Mid-size SLR camera.

Before getting into a complete comparison, here is a simple view of how the E-M1 scores versus the A77 when considering portability, imaging, features and an overall score.

Below is a sample of the gallery pictures for Olympus OM-D E-M1 and Sony SLT-A77. The complete galleries are provided at Olympus E-M1 Gallery and Sony A77 Gallery.

In case you're going to carry around your camera, you need to consider its weight and volume. The Olympus E-M1 provides exterior measurements of 130mm x 94mm x 63mm (5.1" x 3.7" x 2.5") and a weight of 497 grams (1.10 lbs) while the Sony A77 has sizing of 143mm x 104mm x 81mm (5.6" x 4.1" x 3.2") accompanied by a weight of 732 grams (1.61 lbs).

Look at the Olympus E-M1 and Sony A77 in the latest Camera with Lens Size Comparison Tool.

Remember, the weight of an Interchangeable Lens Camera will change dependant on the lens you have at the time. Below is a front view measurement comparison of the E-M1 versus the A77.

Taking into account size and weight, the portability rating of the E-M1 and A77 is 71 and 59 respectively.

Generally, it's tough to imagine the contrast between sensor sizes purely by reading technical specs. The picture here might offer you a clearer sense of the sensor measurements in the E-M1 and A77.

As you have seen, each of these cameras provide different megapixel count and different sensor sizes. The E-M1 featuring a tinier sensor is going to make achieving shallow depth of field tougher and the Sony A77 will offer you extra detail utilizing its extra 8 Megapixels. Greater resolution can also help you crop photos more aggressively. The fresher E-M1 should have an edge when it comes to sensor innovation.