Archived posting to the Leica Users Group, 2003/07/31
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I have been doing a lot of research on this and the most recommended shop is FocalPoint. The price seems to be around $250+ but that depends . Robert VanLane - ----- Original Message ----- From: <rclompus@cox.net> To: <leica-users@mejac.palo-alto.ca.us> Sent: Thursday, July 31, 2003 9:19 AM Subject: [Leica] Crazing Explanation > Robert, > > Crazing usually refers to the breakdown or failure of the anti- > reflective layer coating. It can look like a series of hairline cracks > on the surface of a lens. It is acutally the layer on top of the lens > put there to enhance light transmission. This breakdown can > occur over time and can be accelerated with exposure to some > cleaning agents, extreme temperature shifts and general physical > abuse. The newer antireflective coatings for camera lenses as > well as spectacle lenses can be 9 layers or more including a few > SiO2 (silica dioxide) layers - otherwise known as qaurtz to > enhance scratch resistance. If the crazing covers enough of the > surface area of the front element, it will lower contrast of the image. > I have heard of technicians that can clean the surface and re-coat. > I have nevere seen such a lens after treatment but it is technically > possibel to do so if the lens suface is intact. Perhaps someone on > the list knows the camera technician who polishes and re-coats > lens elements. > > Richard Clompus, OD > Roanoke, VA > > > > Is crazing repairable? > > Robert VanLane > > > -- > To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html > - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html