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 Panasonic FH5 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). Panasonic FH5 has external dimensions of 94 x 54 x 19 mm (3.7 x 2.13 x 0.75″) and weighs 121 g (0.27 lb / 4.27 oz) (including batteries).
Below you can see the front view size comparison of Casio EX-Z450 and Panasonic FH5. Panasonic FH5 is 2mm shorter and 2mm thinner than Casio EX-Z450 but it is also 13mm wider.
Here is the back view size comparison of Casio EX-Z450 and Panasonic FH5.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Panasonic FH5 is 7g lighter than the Casio EX-Z450 but we don't think this will make a significant difference.
Unfortunately neither Casio Exilim EX-Z450 nor Panasonic Lumix DMC-FH5 (Lumix DMC-FS18) 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's 3" LCD screen is slightly larger than Panasonic FH5's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.