Focus correction lens for curved screens?

[Vilya]

Hi,

 

when projecting onto a curved screen, even with projectors especially designed for the purpose like a Barco 909, the (flat) focal plane of the projector and the curvature of the screen don't align, causing blurring.

 

I could not find anything on the net, but is there a hardware solution to this problem? Does a video projector exist whose lens system can correct or at least curve the focal plane of the projector?

 

AFAIK the only system capable of this is the Curvulon, a lens used in the 60ies for special curved screen theatres. Or am I mistaken?

 

http://www.in70mm.com/newsletter/2004/68/l...er_curvulon.htm

 

Thanks a lot :-)

 

Vilya

[MikeR]

Not sure if this will be much help as I cant remember the name of the product but I have seen a screen designed for curved projection that was ground / fabricated in such a way that it retained focus over a curve. Being a thick ground / fabricated lump rather than a film / material type screen it was rather expensive.

[Vilya]

Thanks, but I'm looking more for an optical element for the projector.

 

I found out that the Elumens VisionStation, which has a spherical display, uses a fisheye-like lens called f-theta. "The f-theta lens has a hemispherical optical assembly that allows it to project over a 180-degree range." Are lenses like that available for other projectors? They sell it with the complete setup and besides it's built for spherical screens, not simply curved screens.