Re: New Epson flatbed scanner...

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#51

From: Bart van der Wolf
Date: Wed, 01 Mar 2006 23:35

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"HvdV" <nohanz@svi.nl> wrote in message 
news:b37c7$44060100$3e3aaa83$32224@news.versatel.net...
SNIP
> OTOH, the lens only needs to cope with a single object and image 
> distance,

Not if the flat surface of the glass platen and a (hopefully flat) 
mounted slide are concerned. The 0.75 mm (depending of the particular 
mount) difference is already noticable on my 'ancient' Epson 2450 
Photo. One can only hope that the new 7xx models with their claimed 
resolution have focus control.

> and maybe a somewhat more limited light spectrum as compared to a 
> photographic lens.

There is only a restriction by the combined lamp / dye colors spectum, 
and that spectrum seems to be quite wide if one considers the 
"Ektaspace" profile chromaticities 
(http://www.brucelindbloom.com/index.html?WorkingSpaceInfo.html).

> Compared to other scanners like the Nikon, the oversampled 
> conditions allow on the fly resampling to correct geometrical 
> distortion in software,

I was more referring to the natural behavior of lenses to produce 
non-flatplane focus.

> and a more sensitive CCD combined with brighter light sources could 
> lead to a smaller aperture.

Unfortunately, CCDs have a more or less fixed sensitivity.

> In principle it is also possible to illuminate with different light 
> sources in rapid succession, eliminating the need for lateral 
> chromatic correction.

But would increase calibration problems and component cost. It would 
still require the optical system to have identical correction for the 
different spectra.

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> <4405cf6c$0$11066$e4fe514c@news.xs4all.nl> <b37c7$44060100$3e3aaa83$32224@news.versatel.net>

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From: "Bart van der Wolf" <bvdwolf@no.spam>
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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> <4405cf6c$0$11066$e4fe514c@news.xs4all.nl> <b37c7$44060100$3e3aaa83$32224@news.versatel.net>
Subject: Re: New Epson flatbed scanner...
Date: Thu, 2 Mar 2006 00:35:30 +0100
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