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 FujiFilm S2500HD and Pentax S1 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). Pentax S1 has external dimensions of 114 x 58 x 28 mm (4.49 x 2.28 x 1.1″) and weighs 157 g (0.35 lb / 5.54 oz) (including batteries).
Below you can see the front view size comparison of FujiFilm S2500HD and Pentax S1. Pentax S1 is 15mm shorter and 53mm thinner than FujiFilm S2500HD but it is also 4mm wider.
Here is the back view size comparison of FujiFilm S2500HD and Pentax S1.
Now lets look at the top view comparison of FujiFilm S2500HD and Pentax S1.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Pentax S1 is significantly lighter (180g ) than the FujiFilm S2500HD which may become a big advantage especially on long walking trips.
Unfortunately neither FujiFilm FinePix S2500HD (FinePix S2600HD) nor Pentax Optio S1 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 Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
FujiFilm S2500HD's 3 LCD screen is slightly larger than Pentax S1's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.