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 D3400 and Pentax K-70 side-by-side from the front, back and top in their relative dimensions. Nikon D3400 has external dimensions of 124 x 98 x 76 mm (4.88 x 3.86 x 2.99″) and weighs 395 g (0.87 lb / 13.93 oz) (including batteries). Pentax K-70 has external dimensions of 126 x 93 x 74 mm (4.94 x 3.66 x 2.91″) and weighs 688 g (1.52 lb / 24.27 oz) (including batteries).
Below you can see the front view size comparison of Nikon D3400 and Pentax K-70. Pentax K-70 is 5mm shorter and 2mm thinner than Nikon D3400 but it is also 2mm wider.
Here is the back view size comparison of Nikon D3400 and Pentax K-70.
Now lets look at the top view comparison of Nikon D3400 and Pentax K-70.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon D3400 is significantly lighter (293g ) than the Pentax K-70 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 Nikon D3400 and Pentax K-70 have the same APS-C sized sensor, their lenses for a similar focal length and aperture will be similar in size and weight.
Thanks to the weather sealed body of K-70, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to D3400.
LCD Screen Size and Features
Nikon D3400 and Pentax K-70's LCD screens has the same diagonal size of 3".
On the other hand, Pentax K-70 sports a Fully Articulated screen
which you can change the angle and position of the screen almost freely, making it possible to shoot from waist or over the head levels, and especially very useful for shooting selfies and video. Nikon D3400's LCD screen is a fixed type which provides almost no flexibility in shooting positions compared to K-70.