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 T90 and Sony T900 side-by-side from the front, back and top in their relative dimensions. Sony T90 has external dimensions of 94 x 57 x 15 mm (3.7 x 2.24 x 0.59″) and weighs 148 g (0.33 lb / 5.22 oz) (including batteries). Sony T900 has external dimensions of 98 x 58 x 16 mm (3.86 x 2.28 x 0.63″) and weighs 143 g (0.32 lb / 5.04 oz) (including batteries).
Below you can see the front-view size comparison of the Sony T90 and the Sony T900. Sony T90 is clearly the smaller of the two cameras. Its body is 4mm narrower, 1mm shorter and 1mm thinner than Sony T900.
Here is the back view size comparison of the Sony T90 and Sony T900.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony T900 is 5g lighter than the Sony T90 but we don't think this will make a significant difference.
Weather Sealing
Unfortunately neither the Sony Cyber-shot DSC-T90 nor Sony Cyber-shot DSC-T900 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 T900's 3.50" LCD screen is slightly larger than Sony T90's 3" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.