Sony A7R IV vs Sony a5100

Here, we will be evaluating the Sony A7R IV vs Sony a5100, one being a Pro Mirrorless and the latter is a Entry-Level Mirrorless and both of them are offered by Sony. There is a significant difference between the resolutions of the A7R IV (61MP) and a5100 (24MP) and the A7R IV (Full frame) and a5100 (APS-C) offer totally different sensor size.

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The A7R IV was unveiled 4 years later than the a5100 and that is quite a sizable gap as far as tech is concerned. Both of the cameras feature different body design with the Sony A7R IV being a SLR-style mirrorless camera and the Sony a5100 being a Rangefinder-style mirrorless camera.

Before getting right into a step-by-step comparison, here is a simple view of how the A7R IV scores versus the a5100 when it comes to portability, imaging, features and an overall rating.

Following is a preview of the gallery images for Sony Alpha A7R IV and Sony Alpha a5100. The full galleries are viewable at Sony A7R IV Gallery and Sony a5100 Gallery.

For those who are going to carry your camera often, you should consider its weight and volume. The Sony A7R IV enjoys outside measurements of 129mm x 96mm x 78mm (5.1" x 3.8" x 3.1") and a weight of 665 grams (1.47 lbs) while the Sony a5100 has sizing of 110mm x 63mm x 36mm (4.3" x 2.5" x 1.4") and a weight of 283 grams (0.62 lbs).

Take a look at the Sony A7R IV vs Sony a5100 in the all new Camera and Lens Size Comparison Tool.

Keep in mind, the weight of an Interchangeable Lens Camera will vary dependant on the lens you have at that moment. Underneath is a front view physical size comparison of the A7R IV compared to the a5100.

Taking into consideration size and weight, the portability grade of the A7R IV and a5100 is 62 and 89 respectively.

Generally, it is very difficult to visualise the gap between sensor sizing only by going over specs. The graphic here should offer you a much better sense of the sensor measurements in the A7R IV and a5100.

All in all, both of those cameras feature different megapixel count and different sensor sizing. The A7R IV having a bigger sensor will make achieving bokeh less difficult and the Sony A7R IV will deliver more detail having an extra 37MP. Higher resolution will also let you crop photographs way more aggressively. The newer A7R IV will have an advantage in sensor innovation.