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 E90 and Pentax RS1500 side-by-side from the front, back and top in their relative dimensions. Pentax E90 has external dimensions of 102 x 59 x 25 mm (4.02 x 2.32 x 0.98″) and weighs 145 g (0.32 lb / 5.11 oz) (including batteries). Pentax RS1500 has external dimensions of 114 x 58 x 28 mm (4.49 x 2.28 x 1.1″) and weighs 157 g (0.35 lb / 5.54 oz) (including batteries).
Below you can see the front-view size comparison of the Pentax E90 and the Pentax RS1500. Pentax E90 is 12mm narrower and 3mm thinner than Pentax RS1500 but it is also 1mm taller.
Here is the back view size comparison of the Pentax E90 and Pentax RS1500.
Now lets look at the top view comparison of Pentax E90 and Pentax RS1500.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Pentax E90 is 12g lighter than the Pentax RS1500 but we don't think this will make a significant difference.
Weather Sealing
Thanks to the weather-sealed body of the RS1500, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the E90.
LCD Screen Size and Features
Pentax E90 and Pentax RS1500's LCD screens have the same diagonal size of 2.70 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.