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 Pentax KP and Nikon D780 side-by-side from the front, back and top in their relative dimensions. Pentax KP has external dimensions of 132 x 101 x 76 mm (5.2 x 3.98 x 2.99″) and weighs 703 g (1.55 lb / 24.80 oz) (including batteries). Nikon D780 has external dimensions of 144 x 116 x 76 mm (5.67 x 4.57 x 2.99″) and weighs 840 g (1.85 lb / 29.63 oz) (including batteries).
Below you can see the front-view size comparison of the Pentax KP and the Nikon D780.
Here is the back view size comparison of the Pentax KP and Nikon D780.
Now lets look at the top view comparison of Pentax KP and Nikon D780.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Pentax KP is significantly lighter (137g ) than the Nikon D780 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 also have to take into account the lenses that you will be using with these bodies. Since Nikon D780 has a Full frame sensor and Pentax KP has a smaller APS-C sensor, Pentax KP's lenses for a similar focal length and aperture will generally be lighter and smaller than the Nikon D780 lenses.
Both the KP and the D780 have weather sealings in their bodies, making them resistant to water and dust.
LCD Screen Size and Features
Nikon D780's 3.20" LCD screen is slightly larger than Pentax KP's 3 screen.