Path: utzoo!utgpu!watmath!clyde!att!pacbell!ames!mailrus!cornell!vax5!cnsy From: cnsy@vax5.CIT.CORNELL.EDU Newsgroups: comp.graphics Subject: Re: photographing computer screens Summary: One more opinion (not mine) Message-ID: <17428@vax5.CIT.CORNELL.EDU> Date: 29 Nov 88 15:07:06 GMT References: <8811042303.AA21505@dawn.steinmetz.GE.COM> <76649@sun.uucp> <2663@pixar.UUCP> <7896@bloom-beacon.MIT.EDU> Sender: news@vax5.CIT.CORNELL.EDU Reply-To: cnsy@vax5.cit.cornell.edu (Eric Haines, actually) Organization: 3D/Eye Inc Lines: 33 I passed on the film comments on comp.graphics to our documentation expert, Paul Booth, and he replied to me: First (with apologies to the great Yellow god of Rochester), neither Kodachome nor Ektachrome, in our experience, successfully handle graphics screens. Both want to shift the entire image way over toward cyan (blue). 100 ISO/ASA Fujichrome does a MUCH better job of correctly reproducing the colors on the screen. The blue shift is eliminated, and overall color rendition is far better than Kodak's, though I think the reds can be a little wimpy unless the slide is slightly underexposed. This has held true for both 35mm and 4x5 slides. A good starting exposure for 35mm Fujichrome (or Ektachrome, if you must) is 1 second at f/8. Bracket this base exposure in 1/2 stop increments for 1.5 stops in each direction to make sure that you get a good shot. Also, you should always avoid exposures over 2 or 3 seconds -- a nasty photo demon called reciprocity failure starts to kick in on exposures longer than this, causing colors to shift and exposure relationships to fall apart. Believe me, 8 sec at f/32 is NOT the same as 1 sec at f/8 with color slides! Second, definitely use a longer lens, if you have one, to reduce the distortion caused by the curvature of the screen. A lens in the 100mm to 150mm range is best. -- PBB Hope this adds some worthwhile info to the discussion, Eric Haines (still not John Saponara), ...!hplabs!hpfcla!hpfcrs!eye!erich