Archived posting to the Leica Users Group, 2004/05/19[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]
Burning holes is theoretically possible, but as you say not too plausible. Light will focus onto the curtain, I suppose there could be a magnifying effect but rather doubt it. I suspect we would have heard of Leica's spontaneously combusting if this were true. Chris Saganich -----Original Message----- From: email@example.com [mailto:firstname.lastname@example.org] On Behalf Of Peter Klein Sent: Wednesday, May 19, 2004 1:18 PM To: email@example.com Subject: [Leica] Burning a hole in the shutter On another list, the subject of cloth vs. metal shutters has come up. The danger of the sun burning a hole in the shutter curtain was cited as an advantage of the metal shutter. In over 30 years of using Leicas, I have never burned a hole in my shutter (knock on wood, ptu-ptu-ptu!) . I wonder how long it actually takes to happen. Nowadays I often set my lens to close focus when I'm facing the sun on sunny days, just in case. But I never did this before, and I never had a problem. I suspect normal body movement usually moves the sun's image around enough so that the shutter doesn't "catch." On bright days, lenses are usually stopped down, so less energy reaches the curtain. I suspect that people have to leave the camera lying still in the sun for an appreciable length of time for the shutter to "catch." And probably the lens has to be fairly wide open and focused on or near infinity. I'm curious how much of a danger this really is. Has anyone heard of someone actually testing this out--hopefully on an already bad curtain! :-) Does anyone have any firsthand information about such a test? Or, would anyone who actually burned a hole in their shutter be game enough to tell us how it happened? --Peter P.S. I have seen one Leica with a burnt hole in the shutter. The original shutter on one of my cameras had a little patch over such a hole. I don't know how it happened, because the previous owner said he bought it that way. I happily used the camera until one of the curtain strings failed, at which point I had both curtains replaced. It worked fine before, and it works fine now. _______________________________________________ Leica Users Group. See http://leica-users.org/mailman/listinfo/lug for more information ===================================================================== Please note that this e-mail and any files transmitted with it may be privileged, confidential, and protected from disclosure under applicable law. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any reading, dissemination, distribution, copying, or other use of this communication or any of its attachments is strictly prohibited. If you have received this communication in error, please notify the sender immediately by replying to this message and deleting this message, any attachments, and all copies and backups from your computer.