Olympus E-300 vs Sony A7R III

On this page, we will be looking at the Olympus E-300 and Sony A7R III, former is a Advanced DSLR while the latter is a Pro Mirrorless by brands Olympus and Sony. There is a considerable difference between the resolutions of the E-300 (8MP) and A7R III (42MP) and the E-300 (Four Thirds) and A7R III (Full frame) offer different sensor size.

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The E-300 was unveiled 13 years prior to the A7R III which is quite a large difference as far as tech is concerned. Each of these cameras have different body design with the Olympus E-300 being a Mid-size SLR camera and the Sony A7R III being a SLR-style mirrorless camera.

Before diving right into a in depth comparison, here is a concise overview of how the E-300 grades vs the A7R III with regard to portability, imaging, features and an overall score.

Below is a preview of the gallery images for Olympus E-300 & Sony Alpha A7R III. The full galleries are viewable at Olympus E-300 Gallery & Sony A7R III Gallery.

For anyone who is going to carry around your camera often, you should consider its weight and measurements. The Olympus E-300 enjoys outer dimensions of 147mm x 85mm x 64mm (5.8" x 3.3" x 2.5") with a weight of 624 grams (1.38 lbs) whilst the Sony A7R III has proportions of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") with a weight of 657 grams (1.45 lbs).

See the Olympus E-300 and Sony A7R III in our completely new Camera & Lens Size Comparison Tool.

Keep in mind, the weight of an ILC will differ dependant on the lens you are working with at that moment. Here is a front view proportions comparison of the E-300 versus the A7R III.

Considering size and weight, the portability grade of the E-300 and A7R III is 67 and 63 respectively.

Oftentimes, it is difficult to picture the gap between sensor sizes just by reviewing specifications. The pic underneath will provide you a far better sense of the sensor dimensions in the E-300 and A7R III.

To sum up, the two cameras have different resolutions and different sensor sizes. The E-300 using its tinier sensor is going to make achieving shallow depth of field more difficult and the Sony A7R III will offer greater detail having an extra 34 Megapixels. Higher resolution can also enable you to crop shots a bit more aggressively. The more aged E-300 is going to be disadvantaged with regard to sensor innovation.