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 Casio EX-100 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). Casio EX-100 has external dimensions of 119x67x50 mm and weighs 389 g (including batteries).
Below you can see the front-view size comparison of the Pentax E90 and the Casio EX-100. Pentax E90 is clearly the smaller of the two cameras. Its body is 17mm narrower, 8mm shorter and 25mm thinner than Casio EX-100.
Here is the back view size comparison of the Pentax E90 and Casio EX-100.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Pentax E90 is significantly lighter (244g ) than the Casio EX-100 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Pentax Optio E90 nor Casio Exilim EX-100 provides any type of weather sealing in their bodies, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Casio EX-100's 3.50" LCD screen is slightly larger than Pentax E90's 2.7" screen.
In addition to the size advantage, Casio EX-100 LCD screen also has a
Tilting feature where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels. On the other hand, Pentax E90 has a fixed type screen which provides less flexibility in shooting positions compared to EX-100.