In article <4ugf9q$pgd@Usenet.Logical.NET>, golem@Capital.Net says...

> I believe you are actually discussing the effects
> of oblique projection, whereby the magnification
> increases as you move off-axis. True teles have
> more oblique projection toward the edges simply
> because they are close to the film than regular
> long focus lenses. Inverted teles, or retrofocus
> wideangles, being farther from the film than the
> merely widefield [but non-retro] wide lens will
> exhibit less oblique projection effects. You can
> reasonably think of it as the projected image
> keystoning toward the corners. This is usually
> noticed as the egghead effect.

Are you saying that the rendered perspectives of, say,
a 15mm non-retro type and a retro-focus type super-wide
lens (or a 200mm tele and a 200mm long-focus type lens)
on the same film format would be different? I think that
the image of any lens of any design of a given focal-length,
focus, perspective, and film size is the same regardless of
incident angle on the film (assuming flat film....).
Hope This Helps