Article View: sci.image.processing
Article #332Re: 1: 1 lens wanted
From: robert.m.atkins
Date: Wed, 12 Aug 1992 22:51
Date: Wed, 12 Aug 1992 22:51
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In article <1992Aug12.094518@IASTATE.EDU>, dickw@IASTATE.EDU (Richard Wallingford) writes: > > As for resolution, on an f2.8 lens, the best resolution will > be at f5.8 or f8. For a decent lens, this is typically in the > 80-100 line pairs/mm range. If you're imaging at 1:1 your resolution > may be limited by your sensor (i.e. 8.8mm /512 = 17 microns). > The aerial resolution (i.e. lines/mm in the focal plane (surface) of the lens) should be much more than 80-100 lp/mm for any reasonable lens. The 80-100 lp/mm figure is for the lens+film combination, where the film is always a limiting factor. A halfway decent lens at f8 should resolve around 200 lp/mm (depending on your definition of "resolve"). Resolution would drop to 100 lp/mm somewhere between f11 and f16. =============================================================== Bob Atkins AT&T Bell Labs email (direct) att!clockwise!rma ===============================================================
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<1992Aug12.225121.14812@cbnewsm.cb.att.com>Path:
arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!cbnewsm!ka1gtReferences:
<1992Aug11.165800.8441@swift.cs.tcd.ie> <1992Aug12.094518@IASTATE.EDU>Show Full Headers
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Newsgroups: sci.image.processing,rec.photo Path: arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!cbnewsm!ka1gt From: ka1gt@cbnewsm.cb.att.com (robert.m.atkins) Subject: Re: 1: 1 lens wanted Organization: AT&T Distribution: na Date: Wed, 12 Aug 1992 22:51:21 GMT Message-ID: <1992Aug12.225121.14812@cbnewsm.cb.att.com> Followup-To: rec.photo References: <1992Aug11.165800.8441@swift.cs.tcd.ie> <1992Aug12.094518@IASTATE.EDU> Lines: 19