The Astroscan had a Newtonian reflector layout with a 4⅛” clear-inch (105mm) diameter f/4.2 aluminized and overcoated borosilicate glassparabolicprimary mirror with a focal length of 17½ inches (445mm). The telescope’s secondary mirror was mounted on a flat optical window at the front of the tube. Edmund designer Norman Sperling and optical engineer Mike Simmons came up with the basic design and Peter Bressler Design Associates did the detailed work on this simple introductory telescope. Rather than using a more traditional equatorial or altazimuth mount the Astroscan features a spherical housing around the primary reflector which sat in a cast aluminum cradle. The design was durable and allowed for simple operation by novice amateur astronomers; it won an Industrial Design Award in 1976. The telescope body was made from high impact acrylonitrile butadiene styrene (ABS) plastic and was equipped with a carrying strap to aid portability.
Because it was targeted at the novice market the telescope had its limitations: The general design was for low power hand-held or wide-angle work, the short f/4 focal ratio did not allow for high magnification without the image degrading, and the primary mirror was factory aligned with no provisions for adjustment. The Astroscan came with 15 mm and 28 mm focal length Plössleyepieces, giving it a magnification of 30X and 16X respectively, with a 3.0°field of view using the 28 mm eyepiece, and a 1.6° with the 15 mm.
La charla trató de la presencia de la astronomía en el arte, sobre todo en la pintura, arrancando la primera representación de las pléyades en una cueva de Francia hace 17mil años y haciendo un repaso de la Historia de la pintura occidental.
l 6h⏱ tarde Adela con Helen yArtu👩👧👦 pintandose con mi maquillaje💄 a helen le pica todo nos vamos corriendo a el hopital 🏥 tras meses de tratamiento helen está con sheila la hija 👨👧 de el Rey boletoIII y empiezan a jugar con mila la muñeca coneja🐇