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 A6600 and Sony A6400 side-by-side from the front, back and top in their relative dimensions. Sony A6600 has external dimensions of 120 x 67 x 69 mm (4.72 x 2.64 x 2.72″) and weighs 503 g (1.11 lb / 17.74 oz) (including batteries). Sony A6400 has external dimensions of 120 x 67 x 50 mm (4.72 x 2.64 x 2.36″) and weighs 403 g (0.89 lb / 14.22 oz) (including batteries).
Below you can see the front view size comparison of Sony A6600 and Sony A6400. Sony A6600 has the same height and width with Sony A6400. On the other hand, with a thickness of 69mm, it is 19mm thicker.
Here is the back view size comparison of Sony A6600 and Sony A6400.
Now lets look at the top view comparison of Sony A6600 and Sony A6400.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Sony A6400 is significantly lighter (100g ) than the Sony A6600 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 A6600 and Sony A6400 have the same Sony E lens mount and APS-C sized sensors, lenses will not be a differentiator on total size of the system.
Both A6600 and A6400 have weather sealings in their body, making them resistant to water and dust.
LCD Screen Size and Features
Sony A6600 and Sony A6400'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.