Re: New Epson flatbed scanner...

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#41

From: Bart van der Wolf
Date: Wed, 01 Mar 2006 16:44

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"rafe b" <rafebATspeakeasy.net> wrote in message 
news:uj3b02t0v78c55o79s7ea4stf7pe4b32rr@4ax.com...
SNIP
> I really know very little about optics, and am
> seriously puzzled at the complexity of the Coolscan
> lens.  According to Nikon, it has 14 elements in
> six groups, and six of those 14 elements use ED glass.
>
> Why?  I mean, this is probably more sophisticated
> than any *camera* lens I own.

The main design problems are; Flat plane projection, reduction of 
aberrations, and (presumably) large physical aperture to reduce 
exposure time. The tolerances are small and the projection result is 
'magnified' by the fine sampling by the sensor, so there are many lens 
elements needed to reduce small amounts of residual aberrations from 
preceding lens elements.

Bart

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<1140762568.191486.83070@i40g2000cwc.googlegroups.com> <4403C040.95D2E9ED@killspam.127.0.0.1> <4403C517.C90FC258@killspam.127.0.0.1> <4403cd54$0$1042$61c65585@un-2park-reader-01.sydney.pipenetworks.com.au> <4403F681.2CC350AE@killspam.127.0.0.1> <4404e9c0_5@news.peopletelecom.com.au> <du32a8$32k$1@nnrp.gol.com> <4u4a02tq7b3d52ad39l4s4gtvv2953j8u1@4ax.com> <bf6d0$44056ff7$3ea3eb6a$2088@news.chello.nl> <uj3b02t0v78c55o79s7ea4stf7pe4b32rr@4ax.com>

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From: "Bart van der Wolf" <bvdwolf@no.spam>
Newsgroups: comp.periphs.scanners,aus.photo
References: <1140762568.191486.83070@i40g2000cwc.googlegroups.com> <4403C040.95D2E9ED@killspam.127.0.0.1> <4403C517.C90FC258@killspam.127.0.0.1> <4403cd54$0$1042$61c65585@un-2park-reader-01.sydney.pipenetworks.com.au> <4403F681.2CC350AE@killspam.127.0.0.1> <4404e9c0_5@news.peopletelecom.com.au> <du32a8$32k$1@nnrp.gol.com> <4u4a02tq7b3d52ad39l4s4gtvv2953j8u1@4ax.com> <bf6d0$44056ff7$3ea3eb6a$2088@news.chello.nl> <uj3b02t0v78c55o79s7ea4stf7pe4b32rr@4ax.com>
Subject: Re: New Epson flatbed scanner...
Date: Wed, 1 Mar 2006 17:44:30 +0100
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