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 A2100 IS and Canon A3100 IS side-by-side from the front, back and top in their relative dimensions. Canon A2100 IS has external dimensions of 102 x 64 x 32 mm (4.02 x 2.52 x 1.26″) and weighs 185 g (0.41 lb / 6.53 oz) (including batteries). Canon A3100 IS has external dimensions of 97 x 58 x 28 mm (3.82 x 2.28 x 1.1″) and weighs 165 g (0.36 lb / 5.82 oz) (including batteries).
Below you can see the front-view size comparison of the Canon A2100 IS and the Canon A3100 IS. Canon A3100 IS is clearly the smaller of the two cameras. Its body is 5mm narrower, 6mm shorter and 4mm thinner than Canon A2100 IS.
Comparison image of the Canon A2100 IS and the Canon A3100 IS Size, Weight and External Dimensions - Front View
Here is the back view size comparison of the Canon A2100 IS and Canon A3100 IS.
Comparison image of the Canon A2100 IS and the Canon A3100 IS Size and Weight - Back View
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon A3100 IS is 20g lighter than the Canon A2100 IS but we don't think this will make a significant difference.
Weather Sealing
Unfortunately neither the Canon PowerShot A2100 IS nor Canon PowerShot A3100 IS 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 A2100 IS's 3.00" LCD screen is slightly larger than Canon A3100 IS's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.
