Design of the Mamiya 2.8/80 lens for the C330

Discussion in 'Medium Format Cameras and Accessories' started by MDR, Jan 31, 2012.

  1. MDR

    MDR Member

    Messages:
    1,411
    Joined:
    Sep 1, 2006
    Location:
    Austria
    Shooter:
    Multi Format
    I always believed that the standard lens for the Mamiya TLR was a run of the mill planar, but looking at the manual it's supposed to be a 5 elements in 3 groups lens. The lens schematics resemble neither a Planar, Sonnar, Heliar or Ernostar design so what it is based on?

    Dominik
     
  2. Mackinaw

    Mackinaw Member

    Messages:
    390
    Joined:
    Jan 2, 2005
    Location:
    One hour sou
    Shooter:
    Multi Format
    Kind of looks like it might have been derived from a Tessar. Just a guess though.

    Jim B.
     
  3. dubraro

    dubraro Member

    Messages:
    1
    Joined:
    Dec 13, 2006
    Location:
    Czech Republ
    Shooter:
    35mm RF
    Sekor 2.8/80 is the most similar to ... Leica Elmarit 2.8/90 for Leica.

    sekor.jpg

    The next three lenses seem to belong to a group known as Modified Cook Triplets. In
    the 1930s, Max Berek of Leitz, designed several lenses for use in Leica cameras, based
    on the Cook Triplet. The Sekor 80mm, figure 5, is one of these. The similarity to the
    “Elmarit”, shown in figure 6, is immediately evident. The “Elmarit” is a relatively new
    design, dating from 1958. The Sekor 80mm is considered to be the “normal” lens for
    the Mamiya 6x6 format and operates with excellent aberration correction and
    resolution. Mine seems to be a little subject to flare, which can easily be minimized by
    use of the proper hood.

    Source: Mamiya TLR Interchangeable Lenses by Dr. Robert Smith