It is a threaded opening, like a filter ring, going all the way back to the glass. As my OS has numbers (Heidoskop Anastigmat f3.1 # 555017), I was surprised the Heidosmat was missing such info... Peter On Tue, 1 Nov 2005 16:45:35 -0800 "Richard Knoppow" <dickburk@xxxxxxxxxxxxx> writes: > > ----- Original Message ----- > From: "Peter J Nebergall" <iusar4s@xxxxxxxx> > To: <rollei_list@xxxxxxxxxxxxx> > Sent: Tuesday, November 01, 2005 6:35 AM > Subject: [rollei_list] Re: TLR > > > > Odd question. My postwar Automat (mentioned earlier) is > > missing the > > little retaining ring on the Heidosmat, the one that has > > "Heidosmat" and > > the serial #s. Is this impossible to find? Am I taking > > any risks going > > forth without it? > > > > Peter Nebergall > > --- > > Rollei List > > > Are you sure its missing and not just painted over? I > don't think either the Zeiss or Schneider version of the > lens has a retaining ring on the front. Rather, there is a > threaded shell with a set screw in it. If this was gone the > lenses and spacers would fall out. It would be pretty > obvious. > > --- > Richard Knoppow > Los Angeles, CA, USA > dickburk@xxxxxxxxxxxxx > > --- > 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 > > --- 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