The primary was planned to be  in diameter, and for compactness, the primary f-number will be f/1.5. The final focus will be f/15, delivering a final focus with about 2 mm/arcsecond as its plate scale. Such a giant telescope produces very large seeing-limited images, a challenge for the design of seeing-limited scientific instruments.
The primary mirror was designed to be  in diameter, and to minimize size, the primary f-number will be f/1.5. The final focus will be f/15, resulting in a final focus with about 2 mm/arcsecond as its plate scale. Consequently, this enormous telescope produces very large seeing-limited images, posing a challenge for designing seeing-limited scientific instruments.