Not all anamorphic lenses expand the picture horizontally. Some compress the image vertically. Vertical compression lenses are designed to be left in front of the projector for all material, because you focus the projector so the 16:9 image fits from side to side. To watch 2.35 material with a vertical compression lens, you need an anamorphic stretch scaling mode to expand the picture vertically, which your lens will then re-compress to fit on the screen. To watch non-2.35 material, you need an anamorphic squeeze scaling mode, to compress the image horizontally, and the lens itself will still squeeze it vertically to fit on the screen. If you were to move the lens out of the way, the 16:9 material would overshoot in the top and the bottom, so you need both scaling modes if you want to use the vertical compression lens. The 6010 has both modes. I don't think the 5010 has either.