4. Installation4.5.5 Installing the lens and adjusting the ScheimpflugWARNING : In case of a projector with NVG option, do not insert your fingers in the lens holder if the lens isremoved. They could get hit by the smearing reduction wheel!Image 4-17C AUTION : Make sure that the projection lens and the interpolation lens are a matched set. Replacing any oneof these units requires the replacement of the other.Each of the lenses have Scheimpflug adjustment possibility!Back focal length adjustment is also needed after the projection lens installation. See "Back focal lengthadjustment", page 42 for detailed procedure.Necessary tools• Torx screwdriver T10• Nut spanner or socket spanner 10 mm• Allen key 2 mmHow to prepare the projector lens?1. Screw in 3 Allen bolts M4 into the lens flange. See image 4-18 and image 4-19Tip: Make sure the bolts do not completely go through the flange.2. Fix a nut M4 to the Allen bolts. Do not tighten yet.R59770330 SIM 7QP SERIES 08/12/2014 21