Archived posting to the Leica Users Group, 2002/01/15
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]John, real pushing means that the low areas change in response to changes in exposure. Most films and developers respond to underexposure/overdevelopment by increasing density in the midtones to highlights with the shadow detail going away directly proportional to the amount underexposed. Meaning zone III goes to zone I in a two stop push. Full film speed means that when exposed at the rated speed the gray scale falls as metered. If I recall correctly that also means that an area metered and exposed to produce zone I will produce a density on the neg. at 0.1 over film base plus fog. In answer to your final question, it depends. Increased development will move the areas of the negative that had more photons in a non linear fashion. Or, to be plain, the contrast goes up. So, on your thin negative, the thinnest parts will probably not change appreciably in density while the highlights will blow out. The idea behind the super speed films is that for the first one or two stops there was a linear relationship between increased development and movement at the "speed point". For a lot of people, that doesn't happen which is why there is so much comment about shooting at 1200-1600. Don Dory dorysrus@mindspring.com - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html