1 July 1990 Fast camera for a spectrograph
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The optical design and fabrication of a fast f/1.4 prototype camera for the JNLT are briefly described. The f/1 semisolid Schmidt-Cassegrain camera configuration (a corrector lens plus two aspheric mirrors) developed by Nariai and Yamashita (1987) on the basis of third-order aberration theory is adopted, but the design is modified to reduce the number of aspheric surfaces from four to two. Computer-controlled polishing achieved accuracy of 150 and 200 nm for the corrector plate and secondary mirror, respectively. The use of a constant-radial-shearing interferometer to test the Schmidt corrector plate is explained, and it is reported that the assembled camera had MTF of 55 percent for 100 lp/mm when imaging a 5-micron slit placed in the focal plane.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kyoji Nariai, Yoshiya Matsui, Nobuo Nakamura, Katuo Honda, Qingxin Ru, "Fast camera for a spectrograph", Proc. SPIE 1235, Instrumentation in Astronomy VII, (1 July 1990); doi: 10.1117/12.19121; https://doi.org/10.1117/12.19121


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