A newtonian binoscope. 200mm primary mirror x2 Secondary and tertiary diagonal mirrors 20kg 3D printing from Robert Asumendi Phys , all3dp focuser and tiertary mirror: ultralight version, 7 kg. watch out for OSP2023: 1 please note that, due to larger secondary mirror(67mm sec) being used, central obstruction of 32.5%, will be 4.5% bigger than conventional newtonians(56mm sec) 2 how to attach a finder scope, leaves something to be desired. Maybe a smartphone with a star map app can do. reference: First prototype in OSP2018 indiegogo Facebook Theawesomer Youtube podcast