I want to make a timelapse video for my short film I need to do for my film class. I just want to show the sky go from day to night. What do I need to do this ? I am using a canon 7d. I know I need a remote or something but the one people recommend is like 144$ from canon. I have seen a canon one on amazon for like 30 dollars. I don't need anything fancy, just something to get it done. Any recommendations?