interview genon is a modified hamiltonian newtonian telescope optical designer: V. Y. Terebizh maker: G. Borisov W.F. Hamilton: The chromatic effects of a single positive lens ( objective) may be effectively compensted by a meniscus lens-mirror ( Mangin mirror) . The design concept was originated from Isaac Newton, but unpublished. It's found to be both achromatic and aplanatic cloudynights wiki genon ancprotek genon VT-78a TEC300 VT-70 astronomer ru