Yes. When I was with SGI and Pixar I wrote ray tracing programs.

The problem is he wants visual proof and not "talk".

Bob, I do know those companies and there research in raytracing and radiosity for synthetic image rendering, but "raytracing" in the geometric optics (lens design) world is not at all related to that. Download e.g. the free "Winlens" program and you will see what it is all about raytracing in optics.

Thanx Andre =)
(finally someone who knows what he's talking about Rob)

Andre, actually I was wondering if there is actual improvement after pieces like Aspheron 85mm
http://www.fortvir.net/albums/tom-s-photo-album/deep_curvature.sized.jpg

I know that there are imperfections, but as a whole what would the net effect be? So I was asking for someone to test it if he can, that is. Thank you.

George, I'am happy I could give you a feeling about that stuff. Unfortunately, I can't help you any further on the Aspheron product. I suppose it contains aspherical lens elements like most wide convertors do. It used to be difficult and expensive to manufacture aspheric lens elements but since acrylic lens production technology is well mastered, most consumer cam optics (not only the convertors)contain internal aspherical components. This is much cheaper than using a bunch of different refractive index glass components to fight all kinds of aberations and distortions. If I would buy such a convertor I would first screw it on my cam and see what happens, because depending on your own optics (mainly wide properties) you could end up in vignetting, and/or excessive brightness fall-of in the corners.

Thanx Andre, I was planing to do the same thing =)
I'll have to wait to get the gs400 cam first =/