Tag Archives: refractor

Update on the Hastings-Byrne Refractor

Posted on December 30, 2014 by ST Editors

by John Church At the December AAAP meeting, Gene Ramsey, Dave and Jen Skitt, and the writer reported their progress on a plan to upgrade the refractor mount to make it more usable for both club members and the general … Continue reading →

Posted in January 2015, Sidereal Times | Tagged , , , , | Leave a comment

History of the Hastings-Byrne 6-1/4 Inch Refractor

Posted on November 2, 2014 by ST Editors

by John Church As many current AAAP members may not be fully acquainted with the story of our fine 6-1/4 inch refractor, this history is presented so that the club may make an informed decision about its future use. Also … Continue reading →

Posted in November 2014, Sidereal Times | Tagged , , , , | Leave a comment

Geometrical Optics and the Hastings-Byrne Refractor: Part III

Posted on June 4, 2012 by ST Editors

by John Church In the March and April issues I reviewed the relatively simple equations that allow a lens designer to specify the total curvatures of both elements of a two-element (crown and flint) achromatic refractor objective, and how our … Continue reading →

Posted in June 2012, Sidereal Times | Tagged , , | Leave a comment