The SOFIA telescope concept was discussed with respect to the ambitious NASA specification. Comparisons were drawn between SOFIA and other Zeiss optics like 3.5 m Telescope MPIA and ESO NTT. Recently developed technologies in producing ZERODUR blanks were presented. A distribution of tolerances for the optical system SOFIA was made. The axial mirror support in the telescope was optimized and the lateral support was calculated accordingly. Results for a radial backface support with correcting moment were given. For the SOFIA primary the deformation modes with lowest plate stiffness were calculated and load tolerances were derived. Fast flexible tools for figuring a F/1.0 asphere were discussed - developed in the ROFT program - that could be adapted to the SOFIA thin meniscus. Also a fast interferometric metrology was presented.
"Supporting And Figuring Of SOFIA F/1.0 Thin Zerodur Meniscus", Proc. SPIE 0973, Cryogenic Optical Systems and Instruments III, (27 April 1988); doi: 10.1117/12.948366; https://doi.org/10.1117/12.948366