NC2500S 1. Before Setting Up Your ProjectorA-131.4 Selecting Primary/Anamorphic Lenses for YourProjectorThis section provides guideline information on how to select a screen size and projectormounting position appropriate for your presentation purposes and about selection of types oflenses as well. Select primary/anamorphic lenses for your projector according to theenvironment in which it is installed.Note that all descriptions given in this manual suppose that the angle of projection is zerodegree. Therefore, you need to calculate the projector tilt/pan angle so that it can beminimized during projection when you project slides downward or from a side.1.4.1 Screen TypeThe following two types of screen masks can be used for the DLP Cinema Projector. Checkthe screen mask for your projector for its type before selecting lenses because types ofprimary/anamorphic lenses to be used on the projector and its settings depend upon thetype of screen mask you use.Horizontal moving screen maskScreen masks move horizontally toadjust the screen.Vertical moving screen maskScreen masks move vertically to adjust thescreen.1.4.2 Selection of Anamorphic LensAn anamorphic lens is required when you use a wide screen for projection. Because adifferent type of anamorphic lens should be used according to the type of projector andscreen, determine an appropriate anamorphic lens in consultation with the end user,considering its application purpose. See the table below for available anamorphic lenses.