Tag Archives: herschel condition

How Did Hastings Design Our Objective?

by John Church PART I I’ve often wondered what actual methods Charles Hastings used when designing the 6-1/4” objective now sitting at the business end of our fine refractor in Washington Crossing State Park.  I’ll start by quoting Hastings’ own … Continue reading

Posted in February 2021, Sidereal Times | Tagged , , | Leave a comment