A brief review of current technical activities related to the 15-Meter NNTT is given along with a listing of tentative design goals specified by astronomers. A general comparison is made of filled versus unfilled aperture characteristics. These characteristics will influence the final NNTT concept selection to be made in 1983 between a Segmented Mirror-Telescope (SMT) and a Multiple-Mirror-Telescope (MMT).
L. D. Barr, L. D. Barr,
"The 15-Meter National New Technology Telescope-A Progress Report", Proc. SPIE 0365, Adaptive Optics Systems and Technology, (23 August 1983); doi: 10.1117/12.934195; https://doi.org/10.1117/12.934195