 He also wrote two books on optics, and seems to have planned a third.His demonstrable skill at crafting optics was in demand, leading him to positions as a consultant for various groups and projects, including the construction of three large telescopes—the Schmidt–Cassegrain telescope, the Isaac Newton Telescope, and the Anglo-Australian Telescope—and for NASA.Linfoot died in Cambridge in 1982 at the age of 77, and is buried in the Parish of the Ascension Burial Ground in Cambridge.