My understanding is, you can do it without a lens if you are willing to zoom (i.e. sacrifice pixels and miss out on the sides of the image).
Bear in mind that currently if you go down the lens route, you will also need to buy a video processor such as Lumagen XS/XE.
Panamorph/Folded Space are trying to add anamorphic standards to Bluray and to the various BD players ... I hope it happens but the 2.35 C.I.H. market is quite small. If this happens, you will still need the lens but might be able to live without the video processor (As I understand it).
FYI, the sweet spot of the UH480 is 14.5 - 17.5 feet.
This sub-forum on AVS is quite good for C.I.H. questions :
AVS C.I.H. forum