Is the same basic principle as the production of vinyl records - using a copper plate master? John On 01/04/2010 04:00, "CarlosMFreaza" <cmfreaza@xxxxxxxxx> wrote: ....... there is a detailed explanation about the process to manufacture > the screens, but German technical terminology is not clear to me, > anyway I understood they worked on a copper plate taken as "Master". > These screens were standard for Rollei TLR cameras with > interchangeable focusing screen from 1958 and it's interesting to note > that the factory had special kits to replace the older models ground > glass with the new screens. > --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list