Re: papervision camera formula (was: screen space to 3D space...)

Ralph Hauwert says the camera is broken
http://osflash.org/pipermail/papervision3d_osflash.org/2007-June/007338.html
Marcelo Muniz found out a formula
http://osflash.org/pipermail/papervision3d_osflash.org/2007-June/007428.html
stephen white is not convinced
http://osflash.org/pipermail/papervision3d_osflash.org/2007-June/007454.html
John Grden has talked about it but I wonder what he said?
http://www.laflash.org/node/276
tim knip makes a new camera (without example code or a formula?)
http://www.nabble.com/timk_frustum-td15040366.html#a15041741
Judging from this website
http://www.bdimitrov.de/kmp/technology/fov.html
If I use a FOV of 63 this would equal a standard 35mm Focal Length
camera = new FrustumCamera3D(viewportMain, 63, 10, 2000);
it looks about right but how can I be sure?
Does the GW frustrum camera even work like a true 3D animated camera?
http://home.metrocast.net/%7Echipartist/BlensesSite/Part2.html