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 Olympus E-M10 IV and Canon T8i side-by-side from the front, back and top in their relative dimensions. Olympus E-M10 IV has external dimensions of 122 x 84 x 49 mm (4.8 x 3.31 x 1.93″) and weighs 383 g (0.84 lb / 13.51 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 Olympus E-M10 IV and Canon T8i. Olympus E-M10 IV is clearly the smaller of the two cameras. Its body is 9mm narrower, 19mm shorter and 27mm thinner than Canon T8i.
Here is the back view size comparison of Olympus E-M10 IV and Canon T8i.
Now lets look at the top view comparison of Olympus E-M10 IV and Canon T8i.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Olympus E-M10 IV is significantly lighter (132g ) 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 have to also take into account the lenses that you will be using with these bodies. Since Canon T8i has an APS-C sized sensor and Olympus E-M10 IV has a smaller Four Thirds sensor, Olympus E-M10 IV's lenses for a similar focal length and aperture will generally be lighter and smaller than the Canon T8i lenses.
Unfortunately neither Olympus OM-D E-M10 IV nor Canon EOS Rebel T8i (EOS 850D / EOS Kiss X10i) provides any type of weather sealing in their body, 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 Mirrorless Cameras with Weather Sealing Top DSLR Cameras with Weather Sealing
LCD Screen Size and Features
Olympus E-M10 IV and Canon T8i's LCD screens has the same diagonal size of 3".
Olympus E-M10 IV features a Tilting only screen
which is mostly only good for shooting from waist or over the head levels. On the other hand, Canon T8i sports a Fully Articulated screen
which is more flexible and useful especially for taking Selfie shots and video.