michel

below are 2 twins made to the same exacting standards , both fully erected by 8 dielectric mirrors 99.99% reflective ,on seeing my F15 it has been suggested that I could have made it more compact , not realising that I had already tried and could have easily made it F8 or F6 so why F15 ,after all the longer the harder to make especially these triangulating telescopes , their angles must continuously alter as one focuses on different distances , centralising at all times