Size and weight are big decision factors when you are trying to find the ideal camera for your needs.
In this section, we are going to illustrate the FujiFilm S2500HD and Nikon S3100 side-by-side from the front, back and top in their relative dimensions. FujiFilm S2500HD has external dimensions of 110 x 73 x 81 mm (4.33 x 2.89 x 3.19″) and weighs 337 g (0.74 lb / 11.89 oz) (including batteries). Nikon S3100 has external dimensions of 94 x 58 x 18 mm (3.7 x 2.28 x 0.71″) and weighs 118 g (0.26 lb / 4.16 oz) (including batteries).
Below you can see the front-view size comparison of the FujiFilm S2500HD and the Nikon S3100. Nikon S3100 is clearly the smaller of the two cameras. Its body is 16mm narrower, 15mm shorter and 63mm thinner than FujiFilm S2500HD.
Here is the back view size comparison of the FujiFilm S2500HD and Nikon S3100.
Now lets look at the top view comparison of FujiFilm S2500HD and Nikon S3100.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon S3100 is significantly lighter (219g ) than the FujiFilm S2500HD which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the FujiFilm FinePix S2500HD (FinePix S2600HD) nor Nikon Coolpix S3100 provides any type of weather sealing in their bodies, 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 Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
FujiFilm S2500HD's 3.00" LCD screen is slightly larger than Nikon S3100's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.