This brief review compares the performance on planetary visual/astrophotography of a pair of 6 inch (150mm) of aperture telescopes.

The footage above corresponds to a Jupiter as seen through a Sky-Watcher 150mm f/8 Achromat Refractor OTA. It shows better contrast but a clear secondary spectrum.

The footage below is Jupiter seen through a 150mm 6″ F5 Newtonian telescope. It delivers lower contrast but it lacks of any chromatic aberration.

Music by myself, in order to avoid copyright problems.

Arc length for a curve. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/math/ap-calculus-bc/bc-solved-exams/bc-solved-exams-2011/v/2011-calculus-bc-free-response-3a?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusBC Missed the previous lesson? https://www.khanacademy.org/math/ap-calculus-bc/bc-solved-exams/bc-solved-exams-2011/v/2011-calculus-bc-free-response-1-b-c?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusBC AP Calculus BC on Khan Academy: Learn AP Calculus BC – everything from AP Calculus AB plus a few extra goodies, such as Taylor series, to prepare you for the AP Test About Khan Academy: Khan…

This video provides two basic examples of determine the derivative of an exponential function with the base NOT e. Search Entire Library at www.mathispower4u.wordpress.com

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Videos supplement material from the textbook Physics for Engineers and Scientist by Ohanian and Markery (3rd. Edition) (http://books.wwnorton.com/books/Physics-for-Engineers-and-Scientists/) Feel free to post questions and/or suggestions in the comments and I’ll respond if possible. The videos are mostly for my students, but since others seem to find them useful I’ll help as much as I possibly…

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