Optical Design Assignment 7

Telephoto/Wide-Angle lenses

In this study, we are looking for a family of lenses for a nominal 35-mm format. The gaussian image height and back focal distance is the same in all cases. The field-of-view varies with the focal length. The telephoto lens should be compact. See Kidger, section 9.4 for some discussion of telephoto lenses. Smith's book Modern Lens Design discusses the telephoto lens in Chapter 10 and wide-angle lenses in Chapter 18.

  1. Design a 200-mm focal length f/4 telephoto lens with a half-field angle of 6°. The back focal distance should be between 40-65 mm. Your merit function shoud use our standard visual spectrum, fractional fields of 0, 0.7, and 1.

  2. Design a 20-mm focal length f/3.5 wideangle lens with a half-field angle of 60°. The back focal distance should be between 40-65 mm. Use the same merit function as in the previous problem.

For each lens, provide

  1. a full listing of lens data
  2. a drawing of the lens
  3. ray fans
  4. field curvature/distortion plot
  5. rms spot size vs. field
  6. focal length vs. wavelength
  7. spot diagrams
  8. MTF plots at all fields.

References

Telephoto Lens (Wikipedia, 2009)

Wide-Angle Lens (Wikipedia, 2009)

Sidney F. Ray, Applied Photographic Optics, Imaging Systems for Photography, Film and Video,
Focal Press, 1988. ISBN 0-240-51226-X


Maintained by John Loomis, last updated 21 July 2012