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 Canon R100 and Canon R3 side-by-side from the front, back and top in their relative dimensions. Canon R100 has external dimensions of 116 x 86 x 69 mm (4.57 x 3.39 x 2.72″) and weighs 356 g (0.78 lb / 12.56 oz) (including batteries). Canon R3 has external dimensions of 150 x 143 x 87 mm (5.91 x 5.63 x 3.43″) and weighs 1015 g (2.24 lb / 35.80 oz) (including batteries).
Below you can see the front-view size comparison of the Canon R100 and the Canon R3. Canon R100 is clearly the smaller of the two cameras. Its body is 34mm narrower, 57mm shorter and 18mm thinner than Canon R3.
Here is the back view size comparison of the Canon R100 and Canon R3.
Now lets look at the top view comparison of Canon R100 and Canon R3.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon R100 is significantly lighter (659g ) than the Canon R3 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 Canon R3 has a Full frame sensor and Canon R100 has a smaller APS-C sensor, Canon R100's lenses for a similar focal length and aperture will generally be lighter and smaller than the Canon R3 lenses.
Weather Sealing
Thanks to the weather-sealed body of the R3, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the R100.
LCD Screen Size and Features
Canon R3's 3.20" LCD screen is slightly larger than Canon R100's 3″ screen.
Moreover, Canon R3 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. On the other hand, Canon R100 has a fixed type screen which provides almost no flexibility in shooting positions compared to R3.