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 Fujifilm T550 and Fujifilm T400 side-by-side from the front, back and top in their relative dimensions. Fujifilm T550 has external dimensions of and weighs 136 g (including batteries). Fujifilm T400 has external dimensions of 104 x 59 x 29 mm (4.09 x 2.32 x 1.14″) and weighs 159 g (0.35 lb / 5.61 oz) (including batteries).
Below you can see the front-view size comparison of the Fujifilm T550 and the Fujifilm T400. Fujifilm T550 is clearly the smaller of the two cameras. Its body is 5mm narrower, 2mm shorter and 3mm thinner than Fujifilm T400.
Here is the back view size comparison of the Fujifilm T550 and Fujifilm T400.
Now lets look at the top view comparison of Fujifilm T550 and Fujifilm T400.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Fujifilm T550 is significantly lighter (23g ) than the Fujifilm T400 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Fujifilm FinePix T550 nor Fujifilm FinePix T400 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
Fujifilm T550's 3.00" LCD screen is slightly larger than Fujifilm T400's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.