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 Nikon A900 and Pentax RZ18 side-by-side from the front, back and top in their relative dimensions. Nikon A900 has external dimensions of 113 x 67 x 40 mm (4.45 x 2.64 x 1.57″) and weighs 289 g (0.64 lb / 10.19 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 Nikon A900 and the Pentax RZ18. Pentax RZ18 is clearly the smaller of the two cameras. Its body is 16mm narrower, 6mm shorter and 7mm thinner than Nikon A900.
Here is the back view size comparison of the Nikon A900 and Pentax RZ18.
Now lets look at the top view comparison of Nikon A900 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 (111g ) than the Nikon A900 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 A900.
LCD Screen Size and Features
Nikon A900 and Pentax RZ18's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Nikon A900 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 A900.