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 Sony W310 and Sony W510 side-by-side from the front, back and top in their relative dimensions. Sony W310 has external dimensions of 95 x 55 x 19 mm (3.74 x 2.17 x 0.75″) and weighs 137 g (0.30 lb / 4.83 oz) (including batteries). Sony W510 has external dimensions of 96 x 54 x 20 mm (3.78 x 2.13 x 0.79″) and weighs 119 g (0.26 lb / 4.20 oz) (including batteries).
Below you can see the front-view size comparison of the Sony W310 and the Sony W510. Sony W310 is 1mm narrower and 1mm thinner than Sony W510 but it is also 1mm taller.
Here is the back view size comparison of the Sony W310 and Sony W510.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Weather Sealing
Unfortunately neither the Sony Cyber-shot DSC-W310 nor Sony Cyber-shot DSC-W510 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
Sony W310 and Sony W510's LCD screens have the same diagonal size of 2.70 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.