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 S9100 and Canon ELPH 510 HS side-by-side from the front, back and top in their relative dimensions. Nikon S9100 has external dimensions of 105 x 62 x 35 mm (4.13 x 2.44 x 1.38″) and weighs 214 g (0.47 lb / 7.55 oz) (including batteries). Canon ELPH 510 HS has external dimensions of 99 x 59 x 22 mm (3.9 x 2.32 x 0.87″) and weighs 206 g (0.45 lb / 7.27 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon S9100 and the Canon ELPH 510 HS. Canon ELPH 510 HS is clearly the smaller of the two cameras. Its body is 6mm narrower, 3mm shorter and 13mm thinner than Nikon S9100.
Here is the back view size comparison of the Nikon S9100 and Canon ELPH 510 HS.
Now lets look at the top view comparison of Nikon S9100 and Canon ELPH 510 HS.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon ELPH 510 HS is 8g lighter than the Nikon S9100 but we don't think this will make a significant difference.
Weather Sealing
Unfortunately neither the Nikon Coolpix S9100 nor Canon ELPH 510 HS (IXUS 1100 HS) 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 Compact Cameras with Weather Sealing
LCD Screen Size and Features
Canon ELPH 510 HS's 3.20" LCD screen is slightly larger than Nikon S9100's 3" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.