Archived posting to the Leica Users Group, 2003/09/14
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hello Oliver, That makes sense, especially for still work. I do believe that the person who suggested that director's viewers are Blue is correct, having seen one. That may stem from the majority of motion picture lighting being daylight, (a very blue part of the spectrum) arcs and dichoric filters over tungsten for fill. I'm no photo-physist either. either, just relying on my dimming memory. Of course filters just remove colors or reduce their intensity. They don't turn blue or brown into gray. A iewing filter helps you see what tones a scene might look like in Black and white. But it doesn't adjust for film type. That has to be done in the head. Sonny Sunday, September 14, 2003, 7:34:46 AM, you wrote: OB> Mark, Calumet still sells the Zone VI Wratten #90 viewing filters, mounted OB> in discs with cutouts for 35mm, 4x5 or 6x6 aspect ratios. The discs - about OB> 2 or 3 inches in diameter - are meant to be hung from the neck. OB> Sonny suggested that the color of the monochromatic viewing filter may not OB> matter. I remember from Ansel's class that the reason why the Wratten #90 is OB> used as a viewing filter is that it lets the eye see the tonalities of a OB> scene in a way that approximates the response of panchromatic film. This OB> helps, for example, to avoid merging tonalities. Since my recollection of OB> optical physics is exceedingly dim (pun intended), I do not want to be OB> judged too harshly for saying "the Wratten #90 filter removes chroma", the OB> phrase that sticks in my mind. OB> Oliver Bryk OB> -- OB> To unsubscribe, see OB> http://mejac.palo-alto.ca.us/leica-users/unsub.html - -- Best regards, Sonny mailto:sonc@sonc.com - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html