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 ST65 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 ST65 has external dimensions of 92 x 53 x 17 mm (3.62 x 2.09 x 0.67″) and weighs (including batteries).
Below you can see the front view size comparison of Casio EX-Z450 and Samsung ST65. Samsung ST65 is 3mm shorter and 4mm thinner than Casio EX-Z450 but it is also 11mm wider.
Here is the back view size comparison of Casio EX-Z450 and Samsung ST65.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Samsung ST65 is 128g lighter than the Casio EX-Z450 but we don't think this will make a significant difference.
Unfortunately neither Casio Exilim EX-Z450 nor Samsung ST65 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
Casio EX-Z450 and Samsung ST65's LCD screens has the same diagonal size of 3".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.