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 Nikon D3400 and Canon T8i 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). Canon T8i has external dimensions of 131 x 103 x 76 mm (5.16 x 4.00 x 2.99″) and weighs 515 g (1.14 lb / 18.17 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon D3400 and the Canon T8i.
Here is the back view size comparison of the Nikon D3400 and Canon T8i.
Now lets look at the top view comparison of Nikon D3400 and Canon T8i.
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 (120g ) than the Canon T8i 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 both Nikon D3400 and Canon T8i have the same APS-C sized sensor, their lenses for a similar focal length and aperture will be similar in size and weight.
Weather Sealing
Unfortunately neither the Nikon D3400 nor Canon EOS Rebel T8i (EOS 850D / EOS Kiss X10i) provides any type of weather sealing in their bodies, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top DSLR Cameras with Weather Sealing
LCD Screen Size and Features
Nikon D3400 and Canon T8i's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Canon T8i 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 T8i.