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  • Hybrid diffractive-refractive ultra-wide-angle eyepieces 

    Wang, Zhao-Qi; Zhang, Hui-Juan; Fu, Ru-Lian; Mu, Guo-Guang; Lu, Zhen-Wu; Cartwright, Colin M.; Gillespie, W. A. (Elsevier, 2002)
    Two kinds of hybrid diffractive-refractive ultra-wide-angle (70°) eyepieces are designed which are with considerably reduced apparent size and weight and with comparable or improved aberrations as compared with the ...