Hi PhotonLexicon,
I am looking for a planetarium/hemisphere/projection/wide angle/fish-eye type lens to increase the scan angle of a projector, ideally to 180 degrees for an aerial beam show. For this simple application, most aberrations are no concern so many different types of lenses may be suitable.
Pangolin have a product called "Discoscan" which sounds ideal, but it is very expensive (http://www.pangolin.com/images/widea...scanAngles.gif). Another idea I had is to use the lenses out of a rear projection TV (http://www.dgibbons.members.sonic.net/essay7image.JPG), but I suppose the scan angle would still be smaller than with the Pangolin lens.
Any other ideas for cheap sources of such lenses?
Kind regards,
weartronics