College of Liberal Arts & Sciences
6A65.30 - Distortion - Barrel and Pincushion
Astigmatism and Distortion - Place the desired Moiré' Array design in the object lamp. Place the lamp on the optics rail at the end opposite the camera. Place the large Bell & Howell lens between the camera and the lamp. By moving the lens closer and farther away from the camera the 'pin cushion' and other effects can be demonstrated.
- O-370: "Stops - Apertures & Obstacles", DICK and RAE Physics Demo Notebook.
- O-375: "Thick Lens & Stop", DICK and RAE Physics Demo Notebook.
- John H. Moore, Christopher C. Davis, Michael A. Coplan, "Distortion", Building Scientific Apparatus 2nd Edition, p. 147-148.
- C. Harvey Palmer, "Experiment A13: The Off-Axis Aberrations of Lenses", Optics - Experiments and Demonstrations, John Hopkins Press, 1962.
Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist. The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose. The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources. Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks. These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage. Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.