Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Sony A7 and Sony A7 III side-by-side from the front, back and top in their relative dimensions. Sony A7 has external dimensions of 127 x 94 x 48 mm (5 x 3.7 x 1.89″) and weighs 474 g (1.04 lb / 16.72 oz) (including batteries). Sony A7 III has external dimensions of 127 x 96 x 74 mm (5 x 3.78 x 2.91″) and weighs 650 g (1.43 lb / 22.93 oz) (including batteries).
Below you can see the front view size comparison of Sony A7 and Sony A7 III. Sony A7 has the same height with Sony A7 III. On the other hand, with a width of 94mm, it is 2 narrower and also with a thickness of 48mm, it is 26mm thinner than Sony A7 III.
Here is the back view size comparison of Sony A7 and Sony A7 III.
Now lets look at the top view comparison of Sony A7 and Sony A7 III.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Sony A7 is significantly lighter (176g ) than the Sony A7 III which may become a big advantage especially on long walking trips.
Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you have to also take into account the lenses that you will be using with these bodies. Since both Sony A7 and Sony A7 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 A7 and A7 III have weather sealings in their body, making them resistant to water and dust.
LCD Screen Size and Features
Sony A7 and Sony A7 III's LCD screens has the same diagonal size of 3".
Both cameras feature Tilting screens
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels.