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
Hermanos Conde making guitars until his death in 1995, and now his sons and granddaughter maintain the tradition of "Conde Hermanos" at Atocha 53. Famous Flamenco guitarists such as Mario Escudero, Oscar Herrero, Paco de Lucía, Melchor de Marchena, Andrea Nannetti, Niño Ricardo, Rafael Riqueni, Sabicas, Esteban de Sanlucar, Regino Sainz de la Maza and guitarists with other styles such as David Byrne, Leonard Cohen, Jesse Cook, Al Di Meola, Bob Dylan, Toninho Horta, Steve Howe, Lenny Kravitz, Meiko, Cat Stevens or John Williams have played with Hermanos Conde guitars. Hermanos Conde Hermanos Conde (Conde Brothers) are luthiers, makers of classical and