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 Nikon S30 and Nikon D100 side-by-side from the front, back and top in their relative dimensions. Nikon S30 has external dimensions of 102 x 65 x 40 mm (4.02 x 2.56 x 1.57″) and weighs 214 g (0.47 lb / 7.55 oz) (including batteries). Nikon D100 has external dimensions of 144 x 116 x 81 mm (5.67 x 4.57 x 3.19″) and weighs 780 g (1.72 lb / 27.51 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon S30 and the Nikon D100. Nikon S30 is clearly the smaller of the two cameras. Its body is 42mm narrower, 51mm shorter and 41mm thinner than Nikon D100. As you can tell, actually this is not a fair size comparison since Nikon S30 has a built-in lens but Nikon D100 doesn't. Once you put a lens on D100, its thickness will increase significantly.
Now lets look at the top view comparison of Nikon S30 and Nikon D100.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon S30 is significantly lighter (566g ) than the Nikon D100 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 D100, the total kit will weigh much higher.
Weather Sealing
With its weather-sealed body, we believe that the S30 has a big advantage over the D100 which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Nikon S30's 2.70" LCD screen is slightly larger than Nikon D100's 1.8 screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.