Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Casio EX-Z450 and Samsung ST100 side-by-side from the front, back and top in their relative dimensions. Casio EX-Z450 has external dimensions of 81 x 56 x 21 mm (3.19 x 2.2 x 0.83″) and weighs 128 g (0.28 lb / 4.52 oz) (including batteries). Samsung ST100 has external dimensions of 100 x 60 x 20 mm (3.94 x 2.36 x 0.79″) and weighs 155 g (0.34 lb / 5.47 oz) (including batteries).
Below you can see the front view size comparison of Casio EX-Z450 and Samsung ST100. Casio EX-Z450 is 19mm narrower and 4mm shorter than Samsung ST100 but it is also 1mm thicker.
Here is the back view size comparison of Casio EX-Z450 and Samsung ST100.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Casio EX-Z450 is significantly lighter (27g ) than the Samsung ST100 which may become a big advantage especially on long walking trips.
Unfortunately neither Casio Exilim EX-Z450 nor Samsung ST100 provides any type of weather sealing in their body, 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
Samsung ST100's 3.5" LCD screen is slightly larger than Casio EX-Z450's 3" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.