Add on anamorphic lenses to provide a 2.35:1 image on a 2.35:1 screen are a popular though pricey option. Panamorph is one of the best known names in the market. Its prism-type lenses are more affordable than the more visibly "normal" round lenses, but they work well. Round lenses, such as those from Schneider (below) are more flexible with regards to throw distance (they offer focus separate from that of the projector's own lens) but their prices are higher. We've seen superb setups with both types of lenses.