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 M3 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 M3 has external dimensions of 111 x 68 x 44 mm (4.37 x 2.68 x 1.73″) and weighs 366 g (0.81 lb / 12.91 oz) (including batteries).
Below you can see the front-view size comparison of the Canon R100 and the Canon M3. Canon M3 is clearly the smaller of the two cameras. Its body is 5mm narrower, 18mm shorter and 25mm thinner than Canon R100.
Comparison image of the Canon R100 and the Canon M3 Size, Weight and External Dimensions - Front View
Here is the back view size comparison of the Canon R100 and Canon M3.
Comparison image of the Canon R100 and the Canon M3 Size and Weight - Back View
Now lets look at the top view comparison of Canon R100 and Canon M3.
Top View Comparison image of the Canon R100 and the Canon M3 Size
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon R100 is 10g lighter than the Canon M3 but we don't think this will make a significant difference.
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 Canon R100 and Canon M3 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 Canon EOS R100 nor Canon EOS M3 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 Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Canon R100 and Canon M3's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Canon M3 features a
Tilting screen where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels whereas the Canon R100 has a fixed type screen which provides less flexibility in shooting positions compared to M3.
