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 Canon S100 and Canon ELPH 140 IS side-by-side from the front, back and top in their relative dimensions. Canon S100 has external dimensions of 99 x 60 x 28 mm (3.9 x 2.36 x 1.1″) and weighs 198 g (0.44 lb / 6.98 oz) (including batteries). Canon ELPH 140 IS has external dimensions of 95 x 54 x 22 mm (3.74 x 2.13 x 0.87″) and weighs 127 g (0.28 lb / 4.48 oz) (including batteries).
Below you can see the front-view size comparison of the Canon S100 and the Canon ELPH 140 IS. Canon ELPH 140 IS is clearly the smaller of the two cameras. Its body is 4mm narrower, 6mm shorter and 6mm thinner than Canon S100.
Here is the back view size comparison of the Canon S100 and Canon ELPH 140 IS.
Now lets look at the top view comparison of Canon S100 and Canon ELPH 140 IS.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon ELPH 140 IS is significantly lighter (71g ) than the Canon S100 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Canon PowerShot S100 nor Canon PowerShot ELPH 140 IS (IXUS 150) 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 S100's 3.00" LCD screen is slightly larger than Canon ELPH 140 IS's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.