Archived posting to the Leica Users Group, 2001/03/30
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]>From Wilhelm's "The Permanence and Care of Color Photographs", the estimated cumulative projection times for various slide films before noticeable fading sets in are: Kodachrome 1 hour Fujichrome 5 h 20 min Fujichrome Velvia 4h 45 min Ektachrome (most types) 2h 40 min Agfachrome (most types) 2 hours Conversely, Kodachrome is by far the most stable film in storage. In a nutshell, Wilhelm recommends Kodachrome if projection can be avoided and Fujichrome for slides that are to be projected a lot. How this applies to you depends on how often you project. I started using Kodachrome in 1985. I still have my slides from that year. The most any of them have been projected is 10 times; we usually keep a slide on the screen for no more than 30 seconds, which yields a cumulative time of 5 minutes. If you have similar habits, I would not bother making dupes. If you give a slide show every evening, then obviously it is a different story. (Note: looking at slides on a good light table does not have the same effect) Nathan Dan Honemann wrote: > Someone in photo class last night said that slides will degrade over time if > you project them (due to heat); he only projects dupes. > > Is there any validity to this claim? I only have originals and project them > occasionally (once a month or so), but my oldest slides are still less than > a year old. Should I incur the costs of duping these slides to protect > them? > > What do you do? > > Dan - -- Nathan Wajsman Herrliberg (ZH), Switzerland e-mail: wajsman@webshuttle.ch General photo site: http://belgiangator.tripod.com/ Belgium photo site: http://members.xoom.com/wajsman/ Motorcycle site: http://www.geocities.com/MotorCity/Downs/1704/