There are some sound pedagogical reasons for turning cameras on. Thus, I suggest sharing those reasons with the students before giving them the choice of what to do about their cameras. Explain why you are making your request. For example, being able to see students’ faces gives instructors a quick and easy way to discern whether students are finding the material engaging, at least in smaller classes. One instructor told me that “I asked students to turn their cameras on to say hi to their classmates at the beginning and end of class, and those were the best moments of the class.”