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Suggestion: It could be helpful for the reader to discuss the difference between a relay lens and a field lens. — Preceding unsigned comment added by 194.59.120.162 (talk) 08:51, 4 October 2019 (UTC)
This diagram is obviously wrong. There must be a field lens at or near the prime focus to direct oblique ray bundles to the next lens of the system.180.9.25.250 (talk) 05:16, 26 January 2013 (UTC)