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 MX-1 and Casio EX-100 side-by-side from the front, back and top in their relative dimensions. Pentax MX-1 has external dimensions of 122 x 61 x 51 mm (4.8 x 2.4 x 2.01″) and weighs 391 g (0.86 lb / 13.79 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 MX-1 and the Casio EX-100. Casio EX-100 is 3mm narrower and 1mm thinner than Pentax MX-1 but it is also 6mm taller.
Here is the back view size comparison of the Pentax MX-1 and Casio EX-100.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Casio EX-100 is 2g lighter than the Pentax MX-1 but we don't think this will make a significant difference.
Weather Sealing
Unfortunately neither the Pentax MX-1 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 MX-1's 3" screen.