Pentax RZ18 vs Sony A7R III

Here is a comprehensive overview of the Pentax RZ18 and Sony A7R III, one being a Small Sensor Superzoom and the latter is a Pro Mirrorless by manufacturers Pentax and Sony. There exists a huge gap among the resolutions of the RZ18 (16MP) and A7R III (42MP) and the RZ18 (1/2.3") and A7R III (Full frame) use different sensor sizes.

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The RZ18 was released 7 years before the A7R III and that is a fairly significant gap as far as camera technology is concerned. Each of the cameras come with different body type with the Pentax RZ18 being a Compact camera and the Sony A7R III being a SLR-style mirrorless camera.

Before going straight into a step-by-step comparison, below is a simple summation of how the RZ18 grades vs the A7R III with regard to portability, imaging, features and an overall rating.

This is a preview of the gallery photos for Pentax Optio RZ18 and Sony Alpha A7R III. The complete galleries are available at Pentax RZ18 Gallery and Sony A7R III Gallery.

For anybody who is intending to carry your camera often, you will have to consider its weight and volume. The Pentax RZ18 has got external measurements of 97mm x 61mm x 33mm (3.8" x 2.4" x 1.3") accompanied by a weight of 178 grams (0.39 lbs) and the Sony A7R III has sizing of 127mm x 96mm x 74mm (5.0" x 3.8" x 2.9") having a weight of 657 grams (1.45 lbs).

Look at the Pentax RZ18 and Sony A7R III in the all new Camera with Lens Size Comparison Tool.

Always remember, the weight of an Interchangeable Lens Camera will differ based on the lens you are using at that moment. Underneath is the front view size comparison of the RZ18 and the A7R III.

Using dimensions and weight, the portability grade of the RZ18 and A7R III is 92 and 63 respectively.

Typically, it is very hard to imagine the contrast in sensor sizing just by checking out a spec sheet. The photograph below may give you a better sense of the sensor sizing in the RZ18 and A7R III.

Clearly, each of the cameras posses different resolutions and different sensor sizing. The RZ18 due to its smaller sensor is going to make getting shallower DOF more difficult and the Sony A7R III will provide more detail as a result of its extra 26 Megapixels. Higher resolution will enable you to crop shots somewhat more aggressively. The older RZ18 will be behind when it comes to sensor technology.