NEAF 2021.003: Can Petzval refractors be made faster?

Can our Nagler-Petzval refractors be made as fast as photographic lenses? David introduces Al Nagler to explain. This video originally aired as part of the Northeast Astronomy Forum (NEAF) and Space Expo 2021 Virtual Experience on April 10, 2021. ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 2021 Virtual NEAF: Your Questions Answered with Al and David Nagler Due to the continuing COVID-19 crises, the Northeast Astronomy Forum (NEAF) — “the World’s Largest Astronomy & Space Expo” — was a “virtual,” online-only affair for 2021. However, that is not all bad: it allows people from around the world — who might normally not travel to New York — to experience this special show. On our blog, before the show, we asked for your Tele Vue product questions which would be answered on videos and played at the virtual NEAF on April 10, 2021. The response was tremendous! Though time and slots were limited, we were able to produce seven videos for the show. Each video provides a “front-row” seat to the answer from David and Al Nagler. ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ More Questions? Call Tele Vue Optics to speak to a live person! 1-845-469-4551 9a-5p ET Mon-Fri ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ZWO ASI071MC Pro camera attached to Tele Vue-NP127is is courtesy of Mahendra Mahadeo. Contents copyright 2021 © by Tele Vue Optics, Inc.