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 Nikon L840 and Nikon L830 side-by-side from the front, back and top in their relative dimensions. 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). Nikon L830 has external dimensions of 110 x 76 x 91 mm (4.33 x 2.99 x 3.58″) and weighs 508 g (1.12 lb / 17.92 oz) (including batteries).
Below you can see the front view size comparison of Nikon L840 and Nikon L830. Nikon L830 is clearly the smaller of the two cameras. Its body is 4mm narrower, 13mm shorter and 5mm thinner than Nikon L840.
Here is the back view size comparison of Nikon L840 and Nikon L830.
Now lets look at the top view comparison of Nikon L840 and Nikon L830.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon L830 is 30g lighter than the Nikon L840 but we don't think this will make a significant difference.
Unfortunately neither Nikon Coolpix L840 nor Nikon Coolpix L830 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 Bridge Cameras with Weather Sealing
LCD Screen Size and Features
Nikon L840 and Nikon L830's LCD screens has the same diagonal size of 3".
Both cameras feature Tilting screens
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels.