Each Alstar 1.25 inch O III Filter is individually inspected and proudly inscribed with the percentage of light transmittance of the two O III emission lines
Not only useful at light polluted sites; the contrast is also increased at dark sky sites; can be used with all 1.25 inch eyepieces; Filter made from high grade glass with dichroic interference and antireflection coatings
Completely blocks virtually all other visible wavelengths of light so views of nebulas are optimized; Increases contrast through selective filtration Anti reflection coated to prevent glaring and ghosting
Wider 58 Degree Field of View: The Alstar 1.25 Inch 58-Degree 6 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