Re: filmscanners: NIKON LS 4000 AND D1X

[David <div2000@terra.es>]

Hi Mikael,

In my opinion, a good optics design is when sharpness is
well balanced from the center to corners and not too sharp
in the middle and much less in the corners. Why aspherical
lenses and ED lenses? Chromatic and spherical aberrations 
are higher in the corners and this tech, increases sharpness
in the corners. 

Dave

Mikael Risedal wrote:
> 
> A lens are sharper in the middle, I suggest that you go to        http://www
> Photodo.com
> MTF tests of lenses by Lars Kjellberg or read Norman Koren page
>             http://www.normankoren.com/
> Mikael Risedal
> 
> >From: "Anthony Atkielski" <atkielski.anthony@wanadoo.fr>
> >Reply-To: filmscanners@halftone.co.uk
> >To: <filmscanners@halftone.co.uk>
> >Subject: Re: filmscanners: NIKON LS 4000 AND D1X
> >Date: Mon, 17 Sep 2001 20:30:30 +0200
> >
> >Steve writes:
> >
> > > But you do have the advantage that the centre is
> > > invariably sharper, often much sharper, than the edge.
> >
> >If that is such an advantage, why hasn't anyone designed lenses for 24x36
> >that
> >cover a much larger area than the film frame?  The same logic would apply.
> >
> 
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