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 L31 and Nikon D3S side-by-side from the front, back and top in their relative dimensions. Nikon L31 has external dimensions of 96 x 59 x 29 mm (3.78 x 2.32 x 1.14″) and weighs 160 g (0.35 lb / 5.64 oz) (including batteries). Nikon D3S has external dimensions of 160 x 157 x 88 mm (6.3 x 6.18 x 3.46″) and weighs 1240 g (2.73 lb / 43.74 oz) (including batteries).
Below you can see the front view size comparison of Nikon L31 and Nikon D3S. Nikon L31 is clearly the smaller of the two cameras. Its body is 64mm narrower, 98mm shorter and 59mm thinner than Nikon D3S. As you can tell, actually this is not a fair size comparison since Nikon L31 has a built-in lens but Nikon D3S doesn't. Once you put a lens on D3S, its thickness will increase significantly.
Comparison image of Nikon L31 and Nikon D3S Size, Weight and External Dimensions - Front View
Here is the back view size comparison of Nikon L31 and Nikon D3S.
Comparison image of Nikon L31 and Nikon D3S Size and Weight - Back View
Now lets look at the top view comparison of Nikon L31 and Nikon D3S.
Top View Comparison image of Nikon L31 and Nikon D3S Size
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon L31 is significantly lighter (1080g ) than the Nikon D3S which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on D3S, the total kit will weigh much higher.
Weather Sealing
Thanks to the weather sealed body of D3S, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to L31.
LCD Screen Size and Features
Nikon D3S's 3.00" LCD screen is slightly larger than Nikon L31's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.