Marc: Perhaps you are right regarding some models, however the Biometar 2.8/80 used for the Pentacon six TL, Carl Zeiss Jena, is almost identical regarding the Xenotar 2.8/80, like the 2.8B Biometar 2.8/80 used for the Rolleiflex 2.8B is almost identical regarding the Xenotar. Here is an URL with the Biometar 2.8/80 for the Pentacon six TL and its diagram, similar to the Xenotar clearly: http://www.praktica-users.com/lens/p6lenses/czjbio2.8_80.html All the best Carlos --- Marc James Small <msmall@xxxxxxxxxxxxxx> escribió: > The Biometar is the Zeiss East equivalent to the > Zeiss West Planar and is > quite a sophisticated lens, and one with which you > should be most pleased, > as it is capable of great results. The Praktina is > actually a 35mm > development of the Pentacon, by the way. There is a > grand article awaiting > writing on the history of the Praktina, Zeiss Ikon > East's only solid effort > to battle for a professional status, and one they > dropped immediately > before Zeiss Ikon West introduced the Contarex. > > And thanks for the numbers! > > Marc > > msmall@xxxxxxxxxxxx > Cha robh bàs fir gun ghràs fir! > > NEW FAX NUMBER: +540-343-8505 > > > > --- > 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 > > __________________________________________________ Correo Yahoo! Espacio para todos tus mensajes, antivirus y antispam ¡gratis! ¡Abrí tu cuenta ya! - http://correo.yahoo.com.ar --- 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