Running ML on it won't affect the camera in any way. If you want to revert to original you just swap the card out.
The quality should be a lot better in low light, however the camera is probably in auto everything in video mode. That's why Magic Lantern is so useful, you actually know what the camera is doing with ISO and exposure.
The quality should be a lot better in low light, however the camera is probably in auto everything in video mode. That's why Magic Lantern is so useful, you actually know what the camera is doing with ISO and exposure.