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 FX3 and Sony A7S III side-by-side from the front, back and top in their relative dimensions. Sony FX3 has external dimensions of 130 x 78 x 85 mm (3.07 x 5.12 x 3.35″) and weighs 716 g (including batteries). Sony A7S III has external dimensions of 129 x 97 x 81 mm (5.08 x 3.82 x 3.19″) and weighs 699 g (1.54 lb / 24.66 oz) (including batteries).
Below you can see the front-view size comparison of the Sony FX3 and the Sony A7S III. Sony A7S III is 1mm narrower and 4mm thinner than Sony FX3 but it is also 19mm taller.
Here is the back view size comparison of the Sony FX3 and Sony A7S III.
Now lets look at the top view comparison of Sony FX3 and Sony A7S III.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony A7S III is 17g lighter than the Sony FX3 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 Sony FX3 and Sony A7S III have the same Sony E lens mount and Full frame sized sensors, lenses will not be a differentiator on total size of the system.
Both the FX3 and the A7S III have weather sealings in their bodies, making them resistant to water and dust.
LCD Screen Size and Features
Sony FX3 and Sony A7S III's LCD screens have the same diagonal size of 3.00 inches.