effective focal length = 541.4 in = 13751 mm.
focal plane scale = 15.00 arcsec/mm
Corrector: aspheric/plano 1.19 in thick UBK7 glass
Secondary: 19 inch diameter ULE with turned-down edge (2 fringes Hg green line)
Primary: 43 inch diameter ULE, turned-up edge (9 fringes)
Center Hole: 14 inches in diameter
primary-secondary separation: 194.2 inches
primary-corrector separation: 206.7 inches
secondary-corrector separation: 12.5 inches