At the primary focus of JNLT, three-lens correctors with two aspheric surfaces will be used. They are designed for the wavelength region of 320-500 nm and 440-1100 nm, respectively, and provide images of less than 0.2 arcsec rms radius for a field of 30 arcmin diameter. The corrector for the blue region will include an atmospheric dispersion corrector. Characteristics of aberrations that arises in JNLT primary corrector are discussed.
"Primary corrector of Japanese National Large Telescope", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19192; https://doi.org/10.1117/12.19192