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 Canon 90D 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). Canon 90D has external dimensions of 141 x 105 x 77 mm (5.55 x 4.13 x 3.03″) and weighs 701 g (1.55 lb / 24.73 oz) (including batteries).
Below you can see the front view size comparison of Nikon D810A and Canon 90D. Canon 90D is clearly the smaller of the two cameras. Its body is 5mm narrower, 18mm shorter and 5mm thinner than Nikon D810A.
Here is the back view size comparison of Nikon D810A and Canon 90D.
Now lets look at the top view comparison of Nikon D810A and Canon 90D.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon 90D is significantly lighter (179g ) than the Nikon D810A 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 Nikon D810A has a Full frame sensor and Canon 90D has a smaller APS-C sensor, Canon 90D's lenses for a similar focal length and aperture will generally be lighter and smaller than the Nikon D810A lenses.
Both D810A and 90D have weather sealings in their body, making them resistant to water and dust.
LCD Screen Size and Features
Nikon D810A's 3.20" LCD screen is slightly larger than Canon 90D's 3 screen.