On top of those, some projectors, usually higher end ones, thread the lens barrel for addons such as ND filters or even wide angle lenses to go on top of the prime lens. Navitar is a company that makes these specific type of lenses for projectors. You aren't going to have the best selection of projectors with a screen that size, let alone one decently priced that has enough light to fill it properly. You may want to rethink the screen size and go with something a bit more modest.
I'm thinking of getting a JVC DILA projector. It would mount approximately 17' from the screen. I'm thinking maybe 110" screen. Do you think that would work?
Also do you think that front projectors still give the best picture. I think the projector, can't remember the model, sells for $7,000. The screens seem excessively expensive to me. But my main question is do you think that FP is the very best image?
A lie can travel halfway around the world before the truth gets its shoes on.-- Mark Twain