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 XG-1 and Pentax RZ18 side-by-side from the front, back and top in their relative dimensions. Pentax XG-1 has external dimensions of 119 x 89 x 98 mm (4.69 x 3.5 x 3.84″) and weighs 567 g (1.25 lb / 20.00 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 Pentax XG-1 and the Pentax RZ18. Pentax RZ18 is clearly the smaller of the two cameras. Its body is 22mm narrower, 28mm shorter and 65mm thinner than Pentax XG-1.
Here is the back view size comparison of the Pentax XG-1 and Pentax RZ18.
Now lets look at the top view comparison of Pentax XG-1 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 (389g ) than the Pentax XG-1 which may become a big advantage especially on long walking trips.
Weather Sealing
Thanks to the weather-sealed body of the RZ18, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the XG-1.
LCD Screen Size and Features
Pentax XG-1 and Pentax RZ18'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.