Archived posting to the Leica Users Group, 1997/11/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]>> >>In astronomy they sometimes use special cameras in which the emulsion is >>chilled with liquid nitrogen. I was under the impression that film became >>more sensitive (presumably to both visible light and cosmic rays) at very >>low temperatures. Do any of the amateur astronomers on the LUG know >>anything about this? >> > >I'm not sure about what you mentioned, but the super-cooled instruments >are used in astronomy are typically composed of electronic sensors, not >film emulsions. [snip] Cooling photographic emulsions helps eliminate reciprocity failure when making long exposures of very faint objects. It doesn't necessarily increase the sensitivity of the film, though it may appear to do so. Dan C.