Sony A7R III vs Sony a5100

Lets look more closely at the Sony A7R III and Sony a5100, one being a Pro Mirrorless and the other is a Entry-Level Mirrorless and both of them are produced by Sony. There exists a huge gap between the image resolutions of the A7R III (42MP) and a5100 (24MP) and the A7R III (Full frame) and a5100 (APS-C) possess different sensor dimensions.

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The A7R III was announced 3 years later than the a5100 and that is quite a significant gap as far as technology is concerned. Both of the cameras offer different body type with the Sony A7R III being a SLR-style mirrorless camera and the Sony a5100 being a Rangefinder-style mirrorless camera.

Before getting in to a complete comparison, below is a quick overview of how the A7R III matches up vs the a5100 with regards to portability, imaging, features and an overall grade.

Following is a sample of the gallery pictures for Sony Alpha A7R III and Sony Alpha a5100. The whole galleries are viewable at Sony A7R III Gallery and Sony a5100 Gallery.

In case you're looking to lug around your camera regularly, you will need to think about its weight and size. The Sony A7R III enjoys outside dimensions of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") and a weight of 657 grams (1.45 lbs) whilst the Sony a5100 has specifications of 110mm x 63mm x 36mm (4.3" x 2.5" x 1.4") having a weight of 283 grams (0.62 lbs).

Look at the Sony A7R III and Sony a5100 in the all new Camera with Lens Size Comparison Tool.

Remember, the weight of an Interchangeable Lens Camera will differ based on the lens you are utilizing during that time. Following is the front view dimensions comparison of the A7R III versus the a5100.

Looking at dimensions and weight, the portability score of the A7R III and a5100 is 63 and 89 respectively.

Quite often, it is very hard to imagine the gap between sensor measurements only by checking specs. The visual underneath should provide you a clearer sense of the sensor sizes in the A7R III and a5100.

All in all, the 2 cameras enjoy different megapixel count and different sensor measurements. The A7R III with its larger sensor is going to make achieving shallower DOF easier and the Sony A7R III will resolve extra detail with its extra 18MP. Greater resolution will also allow you to crop images far more aggressively. The fresher A7R III should have an advantage when it comes to sensor tech.