For the ultimate customizability of installation, Ask Proxima offers a choice of five bayonet-style lenses to choose from, depending on your installation needs. The standard lens (which comes with the projector and was used for this review) has a throw ratio that ranges from 1.3 to 2.1 (this means the projector can be placed at a distance from the screen that equals 1.3 to 2.1 times the screen width).
By contrast, the ultra-long zoom lens has a throw ratio ranging from 4.6 to 7.2 and the long zoom lens has a throw ratio of 2.8 to 4.6. There is a standard zoom lens that fits in between the standard lens and the long zoom lens, with a throw ratio of 1.7 to 2.8. There are also two short throw lenses, a short zoom lens with a throw ratio of 1.3 to 1.7 and a wide lens (fixed at 0.8 throw ratio) for rear projection applications.
ASK Proxima fixed install projector E1655U-A
What does this all mean? It means that by choosing the appropriate lens, the projector can display a 80” wide image at distances ranging from as little as 4.27' (51.2") with the fixed lens or as far as 38.38’ (460.6”).
Street prices on these lenses range from $2000 to $3000, with the ultra-long throw zoom being the most expensive.
That seems to be in line with most other manufacturers - price wise, that is.