1. The Canon 800D is a SLR, which has an additional reflector viewfinder system than the M5. The advantage of the reflector viewfinder system is that the optical viewfinder is more power-saving and comfortable, but the disadvantage is that the 800D's viewfinder range is 95. The 800D has a 45-point cross focus system when viewing at eye level. This is a good configuration, focusing speed, focus tracking The accuracy is better;
2. The Canon M5 is a mirrorless (mirror-less) camera, which removes the reflector, uses the sensor-integrated full-pixel dual-core focusing system to focus, and uses electronic eyes and an LCD screen for viewfinding. The electronic viewfinder consumes more power and is affected by the refresh rate. The comfort is not as good as that of the optical viewfinder, but the advantage is that the viewfinder range is 100. Although the 800D has the same performance as the M5 when using an LCD screen to focus, the M5's LCD screen has a better viewing effect (the M5 has a 1.65 million-pixel LCD screen, and the 800D has a 1.04 million-pixel LCD screen);
3. 800D and M5 are equipped with the same CMOS sensor with 24.2 million effective pixels and the same DIGIC 7 image processor. If the same quality lens is used, the image quality will be the same;
4. 800D The advantage is that it has an additional optical viewfinder system (reflector system), and the battery life is also stronger. The 45 cross focus system is fast and has strong focus tracking, but it can only use Canon SLR lenses. The disadvantage is that it is slightly larger; the M5 The advantage is that it is portable. In addition to using Canon's mirrorless lenses, you can also use all Canon SLR lenses through the Canon adapter ring. The disadvantage is that the focus tracking performance (shooting dynamic objects) is not as good as the 800D.