PLANAR Carl Zeiss Oberkochen: f 2,8/80mm, 5 elements, 4 groups, coated, 53º, this lens became excellence synonymous: from March 1954 Rolleiflex 2,8C, Rolleiflex 2.8D, Rolleiflex 2,8/E, Rolleiflex 2.8E2, Rolleiflex 2,8E3, Rolleiflex 2,8F, sharing with the Xenotar 2.8/80 for these cameras up to 1973, it was called OPTON for the Eastern countries. Carl Zeiss built a limited Planar 2,8/80 five elements series -it had been discontinued in 1972- for the 2,8F Platinum special edition in 1984/85, this lens received the HFT (T*) multicoating process becoming the only standard Rollei TLR lens with multilayer coating. This Planar 2,8/80, manufactured by Rollei under CZ license, was used for the Rolleiflex GX models and Rolleiflex FX from 1987 to 2009.
XENOTAR Schneider Kreuznach: f 2,8/80mm, 5 elements, 4 groups, coated, 53º, focusing 1m to infinity. This famous lens was used on the Rolleiflex 2,8 C for the first time from December 1952 sharing with the Planar Zeiss 2.8/80 from March 1954, other models that received this lens were: Rolleiflex 2.8D, Rolleiflex 2,8/E, Rolleiflex 2.8E2, Rolleiflex 2,8E3, Rolleiflex 2,8F, sharing with the Planar Zeiss 2.8/80 for these cameras; Rolleiflex 2,8F Aurum 1983 special edition.
http://dobleobjetivo.blogspot.com/2009/10/rollei-tlr-6x6-lenses.html
Из личного опыта могу добавить, что Ксенотары, выпущенные в 50-е, нередко фонят (не сильно ~ в 10 раз превышают фон: 200-300 мкР у наружной линзы), но снимки с них мне (чисто субъективно) нравятся больше :)
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