Re: [OM] one good thing...

[Winsor Crosby]

>  > Olympus claims their new lens design gets around this problem
> >  by moving the
> >  exit node farther from the film plane, thus making the angle
> >  of attack less
> >  acute. This doesn't sound right -- the angle at which the
> >  light rays strike the
> >  film is, by simple geometry, unavoidably linked to the lens's
> >  angle of view.
> >  How can you make the angle less-acute without simultaneously
> >  reducing the angle
> >  of coverage?
> Isn't this essentially a "retro-focus" lens?  Doesn't the XA's
> 35mm lens fit this definition?  Most zoom lenses are also of
> this design by their very nature. 
>
> AG-inquiring minds want to know-Schnozz
The XA lens is the opposite of a retrofocus design.  Retrofocus 
designs allow a lens placed too far from the lens(because of the SLR 
mirror) to come to focus on the film place. The XA lens was designed 
to be too close to the film for compactness and still focus on the 
film plane.
--
Winsor Crosby
Long Beach, California

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