Pentax RZ18 vs Sony A7 III

Below is a in-depth overview of the Pentax RZ18 and Sony A7 III, former being a Small Sensor Superzoom while the other is a Pro Mirrorless by competitors Pentax and Sony. There exists a large gap between the sensor resolutions of the RZ18 (16MP) and A7 III (24MP) and the RZ18 (1/2.3") and A7 III (Full frame) posses totally different sensor measurements.

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The RZ18 was announced 7 years prior to the A7 III and that is quite a serious difference as far as technology is concerned. Both cameras feature different body design with the Pentax RZ18 being a Compact camera and the Sony A7 III being a SLR-style mirrorless camera.

Before we go straight to a in-depth comparison, here is a quick summation of how the RZ18 scores versus the A7 III in regards to portability, imaging, features and an overall grade.

Following is a sample of the gallery pictures for Pentax Optio RZ18 & Sony Alpha A7 III. The whole galleries are viewable at Pentax RZ18 Gallery & Sony A7 III Gallery.

For anyone who is going to lug around your camera frequently, you should factor in its weight and measurements. The Pentax RZ18 offers exterior dimensions of 97mm x 61mm x 33mm (3.8" x 2.4" x 1.3") with a weight of 178 grams (0.39 lbs) whilst the Sony A7 III has proportions of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") along with a weight of 650 grams (1.43 lbs).

Check the Pentax RZ18 and Sony A7 III in our brand new Camera & Lens Size Comparison Tool.

Remember, the weight of an ILC will change based on the lens you have attached during that time. Below is a front view size comparison of the RZ18 against the A7 III.

Considering dimensions and weight, the portability score of the RZ18 and A7 III is 92 and 63 respectively.

Typically, it can be difficult to visualise the contrast between sensor measurements only by reviewing specs. The photograph here will help give you a far better sense of the sensor dimensions in the RZ18 and A7 III.

As you can plainly see, each of these cameras feature different megapixels and different sensor measurements. The RZ18 having a tinier sensor will make shooting shallower depth of field tougher and the Sony A7 III will offer you greater detail with its extra 8MP. Greater resolution can also allow you to crop images way more aggressively. The older RZ18 is going to be disadvantaged in sensor innovation.