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23 August 1996 Telecentric relay lens systems having distortion and their application in endoscopes
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Telecentric image transmitting systems used in endoscopes and periscopes are mostly of symmetrical construction, and therefore, they are free of distortion. However, in order to improve the general barrel distortion of endoscopes and devices similar to endoscopes, it is desirable to have telecentric relay lens systems for unique magnification, which produce distortion, especially pincushion distortion. This paper describes the construction of a telecentric relay lens system for unique magnification which produces distortion and the imaging peculiarities of such systems. A practical embodiment of a 70-degree endoscope uses a chain of 5 image transmitting systems each producing only 1.5% distortion. As the result, the overall distortion of this endoscope is improved from -15% to -7%.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Eberhard Dietzsch "Telecentric relay lens systems having distortion and their application in endoscopes", Proc. SPIE 2774, Design and Engineering of Optical Systems, (23 August 1996);


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