Olympus E-M1 III vs Sony A100

Let's take a deeper look at the Olympus E-M1 III and Sony A100, former being a Pro Mirrorless while the other is a Entry-Level DSLR by competitors Olympus and Sony. There is a considerable difference between the sensor resolutions of the E-M1 III (20MP) and A100 (10MP) and the E-M1 III (Four Thirds) and A100 (APS-C) provide different sensor sizes.

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The E-M1 III was launched 13 years later than the A100 and that is quite a large difference as far as tech is concerned. Both the cameras feature different body design with the Olympus E-M1 III being a SLR-style mirrorless camera and the Sony A100 being a Compact SLR camera.

Before going straight to a full comparison, here is a simple summation of how the E-M1 III matches up vs the A100 in relation to portability, imaging, features and an overall rating.

The following is a sample of the gallery pics for Olympus OM-D E-M1 Mark III & Sony Alpha DSLR-A100. The complete galleries are viewable at Olympus E-M1 III Gallery & Sony A100 Gallery.

For anybody who is going to carry your camera regularly, you will want to factor its weight and dimensions. The Olympus E-M1 III features exterior dimensions of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") and a weight of 580 grams (1.28 lbs) while the Sony A100 has dimensions of 133mm x 95mm x 71mm (5.2" x 3.7" x 2.8") with a weight of 638 grams (1.41 lbs).

Take a look at the Olympus E-M1 III and Sony A100 in our brand new Camera & Lens Size Comparison Tool.

Remember that, the weight of an ILC will change depending on the lens you have during that time. Underneath is a front view sizing comparison of the E-M1 III compared to the A100.

Factoring in size and weight, the portability rating of the E-M1 III and A100 is 67 and 64 respectively.

Usually, its difficult to picture the difference between sensor sizing only by reviewing specifications. The visual underneath might give you a much better sense of the sensor sizes in the E-M1 III and A100.

To sum up, the two cameras feature different megapixels and different sensor sizing. The E-M1 III featuring a tinier sensor is going to make shooting shallower depth of field more challenging and the Olympus E-M1 III will offer more detail utilizing its extra 10MP. Greater resolution will also let you crop photos way more aggressively. The fresher E-M1 III provides an advantage in sensor tech.