Research and development efforts to improve the performance of telecentric lens design for large-format
cameras are driven by the ever-increasing deployment of these types of systems into the industrial imaging
arena. These lens designs typically have stringent requirements for contrast and resolution (>30% at
100lp/mm) across large sensor sizes (up to 90mm) while maintaining both object- and image-space
telecentricity (0.1° object-space, 0.2° image-space).
This paper explores various characteristics related to large-format telecentric lens designs and
performance. In particular, details around advantages of afocal finite-conjugate imaging, mathematic
expression for chromatic telecentricity, and desensitization of working distance variance are discussed with
reference to geometric optics and aberration theory. Improvement of chromatic telecentricity and relief of
requirement on image-distance accuracy are shown with graphics and MTF plots. Product parameter /
performance data is provided as an example.
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