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 Nikon L840 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). Nikon L840 has external dimensions of 114 x 89 x 96 mm (4.49 x 3.5 x 3.78″) and weighs 538 g (1.19 lb / 18.98 oz) (including batteries).
Below you can see the front view size comparison of Casio EX-Z450 and Nikon L840. Casio EX-Z450 is clearly the smaller of the two cameras. Its body is 33mm narrower, 33mm shorter and 75mm thinner than Nikon L840.
Here is the back view size comparison of Casio EX-Z450 and Nikon L840.
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 (410g ) than the Nikon L840 which may become a big advantage especially on long walking trips.
Unfortunately neither Casio Exilim EX-Z450 nor Nikon Coolpix L840 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 Top Bridge Cameras with Weather Sealing
LCD Screen Size and Features
Casio EX-Z450 and Nikon L840's LCD screens has the same diagonal size of 3".
On the other hand, Nikon L840 features a Tilting screen
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels whereas the Casio EX-Z450 has a fixed type screen which provides less flexibility in shooting positions compared to L840.