Depends on the lens characteristics. Projector's will use different lens's and you did not provide a specific model it's hard to tell you exactly. 7' (H) x 9'(W) you typically are going to be in the 15'-17' feet but this is just a guesstimate. It depends on your projector model.
Answers & Comments
Depends on the lens characteristics. Projector's will use different lens's and you did not provide a specific model it's hard to tell you exactly. 7' (H) x 9'(W) you typically are going to be in the 15'-17' feet but this is just a guesstimate. It depends on your projector model.