Archived posting to the Leica Users Group, 2000/11/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hello, The instructions that came with duplex makes no mention of having to replace the filters but say that the only part that will eventually require replacement in the sodium vapor lamp. I have had mine set up for years and nothing has ever been replaced. Still no fogging - a great safe light. The filters over the vapor tube further restrict the already narrow spectrum and the vanes or flaps control the light intensity. Cheers, Ian - -----Original Message----- From: owner-leica-users@mejac.palo-alto.ca.us [mailto:owner-leica-users@mejac.palo-alto.ca.us]On Behalf Of Mark Rabiner Sent: Thursday, November 16, 2000 2:27 PM To: leica-users@mejac.palo-alto.ca.us Subject: Re: [Leica] Thomas duplex super safelight Frank Filippone wrote: > > Remember that the filters are a thin "plastic" between a sandwich of > glass....... maybe gelatin filter.... material and that they "wear out"..... > they need to be sent back to Thomas every 2 years or whenever you notice the > light fogging your paper..... > > Cost for a new filter set is pretty low.... > > Frank Filippone > red735i@earthlink.net I can't seem to find thier website or email anything. mark rabiner :) http://spokenword.to/rabiner/ I thought the bulb itself was almost not even in need of filtration. That low pressure sodium itself was darn close to only the wavelengths needed.