Archived posting to the Leica Users Group, 1999/09/26
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]From: Andrew Nemeth <azn@nemeng.com> Sent: Sunday, September 26, 1999 09:34 Subject: [Leica] Re: Low Pressure Sodium > Much to my surprise, found that when I scanned the > film (C41 Kodak PJ100) that there was way too much > colour (blues & greens)!!! Discharge lamps are never truly monochromatic. LPS has a very bright yellow line that pretty much blows away everything else. However, with a filter, chances are that you completely removed this line, leaving only the remaining lines closer to the shorter end of the spectrum. As a result, you got bluish green, instead of something correctly color balanced. I daresay that your exposures were a lot longer, too, no? This is why discontinuous spectra usually require custom filters. -- Anthony