John Wall (inventor)

John Wall (26 June 1932 – 27 January 2018) was an English design engineer, amateur astronomer, and amateur telescope maker. He was a member of the British Astronomical Association until his death in 2018. He was known for designing dialyte based refracting telescopes, coming up with the "Zerochromat".
Wall died on 27 January 2018 in Coventry, Warwickshire at the age of 85.