ViewSonic Projector summarizes the projector’s basic and advanced know-how to end users installers or distributors. It contains a bunch of practical information for choosing appropriate projectors in different scenarios. No matter small meeting room middle classroom or big hall ViewSonic Projector tells you how far the projector should be placed according to the room ceiling height projector’s screen size aspect ratio etc. Just input several figures the result will be displayed in the simulation scenarios with measurement. You can use finger to adjust the distance instantly.