Patents Assigned to Balcon Industries, Inc.
  • Internal focusing telephoto lens
    Patent number: 4359272
    Abstract: A new and improved telephoto lens comprising a stationary front positive group, a movable second group employed for internal focusing, a stationary third positive group and a stationary fourth negative group. The lens has a very low telephoto ratio and a very short focusing motion accompanied by a high degree of aberrational correction, all of which is achieved without the use of crystalline or expensive glass materials.
    Type: Grant
    Filed: September 4, 1980
    Date of Patent: November 16, 1982
    Assignee: Balcon Industries, Inc.
    Inventor: Melvyn H. Kreitzer