Feature
Diffraction-limited Endoscope System
Acommon approach in designing an objective-relay system is to design the objective and relay subsystems separately and then simply put them together without further optimization. Although this approach is straightforward, it requires that each subsystem be well corrected, particularly for field curvature and astigmatism. In the case of an endoscope system, which consists of an objective and several sets of relay lenses, it is particularly important that the individual relay sub-units have a very flat anastigmatic field. This is because the field curvature of the complete relay system is equal to that of a single sub-unit multiplied by the number of units, typically four or five.
Log in or become a member to view the full text of this article.
This article may be available for purchase via the search at Optica Publishing Group.
Optica Members get the full text of Optics & Photonics News, plus a variety of other member benefits.