How big of a backdrop do I need?
A 5 or 6-foot wide backdrop is ideal for a medium close-up talking-head video of one person. If you intend to have a medium close-up of two or three people together a better option would be a 9 or 10ft wide backdrop. If you are shooting against a blue or screen background, go for the larger backdrop. Your presenter can then move away from the backdrop to minimize color spill.