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 Pentax K-70 and Nikon D3400 side-by-side from the front, back and top in their relative dimensions. 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). 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).
Below you can see the front view size comparison of Pentax K-70 and Nikon D3400. 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 Pentax K-70 and Nikon D3400.
Now lets look at the top view comparison of Pentax K-70 and Nikon D3400.
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 Pentax K-70 and Nikon D3400 have the same APS-C sized sensor, their lenses for a similar focal length and aperture will be similar in size and weight.
With its weather sealed body, we believe that K-70 has a big advantage over D3400 which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Pentax K-70 and Nikon D3400'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.