Sony a5100 vs Sony FX3

Below, we are comparing the Sony a5100 and Sony FX3, former being a Entry-Level Mirrorless while the other is a Pro Mirrorless and both are sold by Sony. There is a large difference among the sensor resolutions of the a5100 (24MP) and FX3 (12MP) and the a5100 (APS-C) and FX3 (Full frame) use totally different sensor size.

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The a5100 was unveiled 7 years before the FX3 and that is a fairly serious difference as far as camera tech is concerned. Both the cameras come with the identical body type (Rangefinder-style mirrorless).

Before diving in to a in-depth comparison, below is a brief highlight of how the a5100 matches up versus the FX3 for portability, imaging, features and an overall grade.

Below is a sample of the gallery pictures for Sony Alpha a5100 & Sony FX3. The full galleries are provided at Sony a5100 Gallery & Sony FX3 Gallery.

When you are looking to lug around your camera often, you will have to factor its weight and proportions. The Sony a5100 has got physical measurements of 110mm x 63mm x 36mm (4.3" x 2.5" x 1.4") with a weight of 283 grams (0.62 lbs) and the Sony FX3 has measurements of 130mm x 78mm x 85mm (5.1" x 3.1" x 3.3") having a weight of 716 grams (1.58 lbs).

Look at the Sony a5100 and Sony FX3 in our completely new Camera plus Lens Size Comparison Tool.

Don't forget, the weight of an ILC will change dependant on the lens you use at the time. The following is the front view scale comparison of the a5100 against the FX3.

Considering size and weight, the portability score of the a5100 and FX3 is 89 and 62 respectively.

In many cases, its hard to see the difference in sensor measurements merely by researching specs. The graphic here should offer you a much better sense of the sensor sizing in the a5100 and FX3.

As you can plainly see, the two cameras have got different megapixel count and different sensor measurements. The a5100 with its smaller sensor will make achieving shallower depth of field tougher and the Sony a5100 will provide you with greater detail having an extra 12MP. Greater resolution will also help you crop photos much more aggressively. The older a5100 will be disadvantaged with regard to sensor innovation.