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 Olympus E-400 and Olympus E-510 side-by-side from the front, back and top in their relative dimensions. Olympus E-400 has external dimensions of 130 x 91 x 53 mm (5.12 x 3.58 x 2.09″) and weighs 435 g (0.96 lb / 15.34 oz) (including batteries). Olympus E-510 has external dimensions of 136 x 92 x 68 mm (5.35 x 3.62 x 2.68″) and weighs 490 g (1.08 lb / 17.28 oz) (including batteries).
Below you can see the front-view size comparison of the Olympus E-400 and the Olympus E-510. Olympus E-400 is clearly the smaller of the two cameras. Its body is 6mm narrower, 1mm shorter and 15mm thinner than Olympus E-510.
Comparison image of the Olympus E-400 and the Olympus E-510 Size, Weight and External Dimensions - Front View
Here is the back view size comparison of the Olympus E-400 and Olympus E-510.
Comparison image of the Olympus E-400 and the Olympus E-510 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.
Olympus E-400 is 55g lighter than the Olympus E-510 but we don't think this will make a significant difference.
Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you also have to take into account the lenses that you will be using with these bodies. Since both Olympus E-400 and Olympus E-510 have the same Four Thirds lens mount and Four Thirds sized sensors, lenses will not be a differentiator on total size of the system.
Weather Sealing
Unfortunately neither the Olympus E-400 nor Olympus E-510 / EVOLT E-510 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 DSLR Cameras with Weather Sealing
LCD Screen Size and Features
Olympus E-400 and Olympus E-510's LCD screens have the same diagonal size of 2.50 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.
