Hyperbolic stainless steel mirror

This is the model of NeoVision HS3. We bought this mirror for Omnidirectional camera ( http://en.wikipedia.org/wiki/Omnidirectional_camera ). By using this mirror, you can create a 360 degree view of image.
The surface equation is z^2/789,3274 - (x^2+y^2)/548,1440 = 1
The product detail can be find at
http://www.neovision.cz/prods/panoramic/h3s.html