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 Canon SD940 IS and Samsung ST6500 side-by-side from the front, back and top in their relative dimensions. Canon SD940 IS has external dimensions of 89 x 55 x 20 mm (3.5 x 2.17 x 0.79″) and weighs 120 g (0.26 lb / 4.23 oz) (including batteries). Samsung ST6500 has external dimensions of 102 x 57 x 19 mm (4.02 x 2.24 x 0.75″) and weighs (including batteries).
Below you can see the front view size comparison of Canon SD940 IS and Samsung ST6500. Canon SD940 IS is 13mm narrower and 2mm shorter than Samsung ST6500 but it is also 1mm thicker.
Here is the back view size comparison of Canon SD940 IS and Samsung ST6500.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Samsung ST6500 is 120g lighter than the Canon SD940 IS but we don't think this will make a significant difference.
Unfortunately neither Canon PowerShot SD940 IS / Digital IXUS 120 IS nor Samsung ST6500 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 Compact Cameras with Weather Sealing
LCD Screen Size and Features
Samsung ST6500's 3" LCD screen is slightly larger than Canon SD940 IS's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.