Eliminate the need to make focus adjustments when changing telescope eyepieces
They are made of precision machined aluminium with black anodizing
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 2.5 mm wide angle telescope eyepiece 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: Compatible with any telescope equipped with 1.25 inch focuser and the 1.25 inch female thread can also be connected with 1.25 inch telescope filter or other 1.25 inch telescope accessories; Whether for planetary observation or deepsky exploration this eyepiece delivers sharp and clear images meeting your high standards for stargazing