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 Pentax RZ18 and Panasonic ZS40 side-by-side from the front, back and top in their relative dimensions. 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). Panasonic ZS40 has external dimensions of 111 x 64 x 34 mm (4.37 x 2.52 x 1.34″) and weighs 240 g (0.53 lb / 8.47 oz) (including batteries).
Below you can see the front-view size comparison of the Pentax RZ18 and the Panasonic ZS40. Pentax RZ18 is clearly the smaller of the two cameras. Its body is 14mm narrower, 3mm shorter and 1mm thinner than Panasonic ZS40.
Here is the back view size comparison of the Pentax RZ18 and Panasonic ZS40.
Now lets look at the top view comparison of Pentax RZ18 and Panasonic ZS40.
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 (62g ) than the Panasonic ZS40 which may become a big advantage especially on long walking trips.
Weather Sealing
With its weather-sealed body, we believe that the RZ18 has a big advantage over the ZS40 which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Pentax RZ18 and Panasonic ZS40's LCD screens have the same diagonal size of 3.00 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.