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Article #43Re: New Epson flatbed scanner...
From: HvdV
Date: Wed, 01 Mar 2006 20:16
Date: Wed, 01 Mar 2006 20:16
18 lines
2595 bytes
2595 bytes
Bart van der Wolf wrote: > 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. OTOH, the lens only needs to cope with a single object and image distance, and maybe a somewhat more limited light spectrum as compared to a photographic lens. Compared to other scanners like the Nikon, the oversampled conditions allow on the fly resampling to correct geometrical distortion in software, and a more sensitive CCD combined with brighter light sources could lead to a smaller aperture. In principle it is also possible to illuminate with different light sources in rapid succession, eliminating the need for lateral chromatic correction. Together, these things would lead to a vastly cheaper lens. -- Hans
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X-Google-Thread: f75de,a67d5152fd90ea94 X-Google-Thread: 109d17,a67d5152fd90ea94 X-Google-Attributes: gidf75de,gid109d17,public X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news1.google.com!news3.google.com!news4.google.com!news.glorb.com!solnet.ch!solnet.ch!nntpfeed.zonnet.nl!news.versatel.net!not-for-mail Date: Wed, 01 Mar 2006 21:16:00 +0100 From: HvdV <nohanz@svi.nl> Reply-To: nohanz@svi.nl Organization: SVI User-Agent: Mozilla/5.0 (X11; U; IRIX64 IP30; en-US; rv:1.6) Gecko/R-A-C X-Accept-Language: en-us, en MIME-Version: 1.0 Newsgroups: comp.periphs.scanners,aus.photo Subject: Re: New Epson flatbed scanner... 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> In-Reply-To: <4405cf6c$0$11066$e4fe514c@news.xs4all.nl> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Message-ID: <b37c7$44060100$3e3aaa83$32224@news.versatel.net> X-Complaints-To: abuse@versatel.nl Lines: 18 NNTP-Posting-Host: 62.58.170.131 (62.58.170.131) NNTP-Posting-Date: Wed, 01 Mar 2006 21:16:00 +0100 X-Trace: b37c7440601009b9f0f2632224