The design parameters for the Magellan f/11 configuration can be found in telescope System Specification. The important parameters are repeated here in the table below.
primary diameter: 6.5 m (255.9 inches)
focal length: 71526.4 mm (2816 inches)
plate scale: 346.77 microns/arc-sec
2.88 arc-sec/mm
(0.01365 in/arc-sec) (73.2474 arc-sec/in)
field of view: 30 arc-min dia.
1800 arc-sec dia.
field area: 706.8 arc-min2
2.54E6 arc-sec2
focal surf. rad. of curv.: -1231.74 mm (convex) (48.49 inches)
focal surf. diameter: 620 mm (24.42 inch dia.)
focal surf. sagitta: 39.7 mm (1.56 inches)