Olympus E-M1 vs Sony A900

Below is a thorough comparison of the Olympus E-M1 versus Sony A900, former being a Pro Mirrorless while the latter is a Advanced DSLR by competitors Olympus and Sony. There is a substantial difference among the image resolutions of the E-M1 (16MP) and A900 (25MP) and the E-M1 (Four Thirds) and A900 (Full frame) come with totally different sensor sizes.

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The E-M1 was released 5 years later than the A900 and that is a fairly big difference as far as camera tech is concerned. Both of these cameras come with different body type with the Olympus E-M1 being a SLR-style mirrorless camera and the Sony A900 being a Mid-size SLR camera.

Before going in to a step-by-step comparison, below is a brief summation of how the E-M1 grades vs the A900 in relation to portability, imaging, features and an overall grade.

Below is a preview of the gallery images for Olympus OM-D E-M1 & Sony Alpha DSLR-A900. The complete galleries are available at Olympus E-M1 Gallery & Sony A900 Gallery.

If you are going to lug around your camera regularly, you'll need to factor its weight and measurements. The Olympus E-M1 enjoys physical measurements of 130mm x 94mm x 63mm (5.1" x 3.7" x 2.5") and a weight of 497 grams (1.10 lbs) and the Sony A900 has proportions of 156mm x 117mm x 82mm (6.1" x 4.6" x 3.2") accompanied by a weight of 895 grams (1.97 lbs).

See the Olympus E-M1 versus Sony A900 in our brand new Camera plus Lens Size Comparison Tool.

Do not forget, the weight of an ILC will differ based on the lens you have during that time. The following is the front view sizing comparison of the E-M1 compared to the A900.

Considering size and weight, the portability score of the E-M1 and A900 is 71 and 54 respectively.

Usually, its hard to see the contrast in sensor measurements merely by viewing a spec sheet. The photograph underneath may provide you a better sense of the sensor measurements in the E-M1 and A900.

As you can see, both of those cameras have got different megapixel count and different sensor measurements. The E-M1 because of its smaller sensor will make achieving bokeh harder and the Sony A900 will result in greater detail as a result of its extra 9MP. Higher resolution can also let you crop shots much more aggressively. The more recent E-M1 is going to have an advantage when it comes to sensor tech.