Patents Assigned to Steven Spence Adkinson
  • Collapsible terrestrial telescope
    Patent number: 5444569
    Abstract: A collapsible terrestrial telescope having a lens system which includes an objective lens and a terrestrial eyepiece, wherein the eyepiece includes an erecting lens group, and an eyepiece lens. The objective lens and the erecting lens group each include an aspheric surface. The objective lens may be one of an optically interchangeable doublet including a positive element having the aspheric surface and a negative element, or a singlet having the aspheric surface and a diffractive surface.
    Type: Grant
    Filed: March 12, 1993
    Date of Patent: August 22, 1995
    Assignee: Steven Spence Adkinson
    Inventor: Barry G. Broome