| Popis: |
An afocal meniscus lens is proposed for reducing intrinsic astigmatism in an RC telescope. In comparison to existing solutions using thin aspheric plates near focus, the proposed solution does not disrupt the aplanatic correction of the initial RC design but reduces astigmatism and eliminates field curvature. Despite some residual lateral color introduced by the lens corrector, the field of view in the original RC design can be extended by a factor of 2 while maintaining the diffraction-limited image quality in the system. |
