A novel lens system with correction of secondary spectrum without using anomalous glasses is presented. The lens system comprises four separated lens components, with three of them being subapertures. Two examples of apochromatic telescope are presented, both with the use of typical normal glasses, namely crown K9 and flint F5 glasses, and low-cost slightly anomalous dispersion glasses. Secondary spectrum and other chromatic aberrations of the two design examples are corrected.
© 2008 Chinese Optics Letters
(080.1010) Geometric optics : Aberrations (global)
(110.6770) Imaging systems : Telescopes
(160.2750) Materials : Glass and other amorphous materials
(220.3620) Optical design and fabrication : Lens system design
Qinghua Yang, Baochang Zhao, and Renkui Zhou, "Design of apochromatic telescope without anomalous dispersion glasses," Chin. Opt. Lett. 6, 146-148 (2008)