Eliminate the need to make focus adjustments when changing telescope eyepieces
With parfocal ring equipped telescope eyepieces you can change magnifications quickly and easily
This set of 3 Alstar Parfocal Rings lets you make a set of non-parfocal 1.25" telescope eyepieces parfocal for more efficient observing
Wider 58 Degree Field of View: The Alstar 1.25 Inch 58-Degree 8 mm wide angle telescope eyepieceis is designed for astronomy enthusiasts; Offering a focal length range of 2.5 mm to 25 mm and a 58-degree wide field of view to capture more celestial details
Standard 1.25 Inch Barrel and Thread: Designed primarily for planetary observation such as Moon Jupiter Mars and Saturn and more but great for deep sky objects too; Comfortable eye relief averaging 16 mm across the series; Threaded for standard 1.25 inch astronomy filters