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 Samsung TL225 and Pentax VS20 side-by-side from the front, back and top in their relative dimensions. Samsung TL225 has external dimensions of 100 x 60 x 19 mm (3.94 x 2.36 x 0.75″) and weighs 187 g (0.41 lb / 6.60 oz) (including batteries). Pentax VS20 has external dimensions of 111 x 61 x 38 mm (4.37 x 2.4 x 1.5″) and weighs 235 g (0.52 lb / 8.29 oz) (including batteries).
Below you can see the front-view size comparison of the Samsung TL225 and the Pentax VS20. Samsung TL225 is clearly the smaller of the two cameras. Its body is 11mm narrower, 1mm shorter and 19mm thinner than Pentax VS20.
Here is the back view size comparison of the Samsung TL225 and Pentax VS20.
Now lets look at the top view comparison of Samsung TL225 and Pentax VS20.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Samsung TL225 is significantly lighter (48g ) than the Pentax VS20 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Samsung TL225 (ST550) nor Pentax Optio VS20 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
Samsung TL225's 3.50" LCD screen is slightly larger than Pentax VS20's 3" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.