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 Nikon D810A and Nikon D800 side-by-side from the front, back and top in their relative dimensions. Nikon D810A has external dimensions of 146 x 123 x 82 mm (5.75 x 4.84 x 3.23″) and weighs 880 g (1.94 lb / 31.04 oz) (including batteries). Nikon D800 has external dimensions of 146 x 123 x 82 mm (5.75 x 4.84 x 3.23″) and weighs 900 g (1.98 lb / 31.75 oz) (including batteries).
Below you can see the front view size comparison of Nikon D810A and Nikon D800. In this case, we can see that Nikon D810A and Nikon D800 have the exact same height, width and thickness.
Here is the back view size comparison of Nikon D810A and Nikon D800.
Now lets look at the top view comparison of Nikon D810A and Nikon D800.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon D810A is 20g lighter than the Nikon D800 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 have to also take into account the lenses that you will be using with these bodies. Since both Nikon D810A and Nikon D800 have the same Nikon F lens mount and Full frame sized sensors, lenses will not be a differentiator on total size of the system.
Both D810A and D800 have weather sealings in their body, making them resistant to water and dust.
LCD Screen Size and Features
Nikon D810A and Nikon D800's LCD screens has the same diagonal size of 3.2".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.