Size and weight are big decision factors when you are trying to find the ideal camera for your needs.
In this section, we are going to illustrate the Sony RX10 III and Pentax RZ18 side-by-side from the front, back and top in their relative dimensions. Sony RX10 III has external dimensions of 133 x 94 x 127 mm (5.24 x 3.7 x 5″) and weighs 1051 g (2.32 lb / 37.07 oz) (including batteries). Pentax RZ18 has external dimensions of 97 x 61 x 33 mm (3.82 x 2.4 x 1.3″) and weighs 178 g (0.39 lb / 6.28 oz) (including batteries).
Below you can see the front-view size comparison of the Sony RX10 III and the Pentax RZ18. Pentax RZ18 is clearly the smaller of the two cameras. Its body is 36mm narrower, 33mm shorter and 94mm thinner than Sony RX10 III.
Here is the back view size comparison of the Sony RX10 III and Pentax RZ18.
Now lets look at the top view comparison of Sony RX10 III and Pentax RZ18.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Pentax RZ18 is significantly lighter (873g ) than the Sony RX10 III which may become a big advantage especially on long walking trips.
Weather Sealing
Both the RX10 III and the RZ18 have weather sealings in their bodies, making them resistant to water and dust.
LCD Screen Size and Features
Sony RX10 III and Pentax RZ18's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Sony RX10 III features a
Tilting screen where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels whereas the Pentax RZ18 has a fixed type screen which provides less flexibility in shooting positions compared to RX10 III.