Newtonian telescope secondary mirror. This design reduces the size and cost of the telescope with a shorter overall telescope tube length (with the corrector extending the focal length in a "telephoto" type layout) combined with a less costly spherical mirror. Commercially produced versions of this design have been noted to be optically compromised due to the difficulty of producing a correctly shaped sub-aperture corrector in a telescope targeted at the inexpensive end of the telescope market. Newtonian telescope The Newtonian telescope, also called the Newtonian reflector or just the Newtonian, is a type of reflecting telescope invented by the English scientist Sir
Julio Conde death of his brothers Faustino y Mariano in the years 1988 and 1989, Julio, the only nephew successor, continued enlarging even more the figure of the high quality handmade guitar inside and outside our frontiers. At the present time, and from Julio's death in 1995, their sons and his granddaughter, in the same centre, continue the tradition Hermanos Conde, where the careful selection of materials and the quality of the final sound are maintained and continue as a high-priority goal. Julio Conde Julio Conde (Villalba de los Alcores, Valladolid, 1915 - Madrid, 1995) was a spanish luthier trained by his