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 Olympus TG-4 and Nikon S640 side-by-side from the front, back and top in their relative dimensions. Olympus TG-4 has external dimensions of 112 x 66 x 31 mm (4.41 x 2.6 x 1.22″) and weighs 247 g (0.54 lb / 8.71 oz) (including batteries). Nikon S640 has external dimensions of 91 x 55 x 21 mm (3.58 x 2.17 x 0.83″) and weighs 130 g (0.29 lb / 4.59 oz) (including batteries).
Below you can see the front-view size comparison of the Olympus TG-4 and the Nikon S640. Nikon S640 is clearly the smaller of the two cameras. Its body is 21mm narrower, 11mm shorter and 10mm thinner than Olympus TG-4.
Here is the back view size comparison of the Olympus TG-4 and Nikon S640.
Now lets look at the top view comparison of Olympus TG-4 and Nikon S640.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon S640 is significantly lighter (117g ) than the Olympus TG-4 which may become a big advantage especially on long walking trips.
Weather Sealing
Thanks to the weather-sealed body of the TG-4, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the S640.
LCD Screen Size and Features
Olympus TG-4's 3.00" LCD screen is slightly larger than Nikon S640's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.