Adjust the Focusing Ring for Precise Calibration: When changing the 1.25 inch eyepiece of the telescope; refocusing is not required; enabling rapid switching; maintain sharp focus for planetary observation and astrophotography
All-Aluminum metal Construction: It is treated with black anodic oxidation; featuring excellent wear resistance and a long service life; precisely processed to ensure compatibility with a variety of telescope eyepieces
Easily Increase Magnification: With parfocal ring equipped telescope eyepieces you can change magnifications quickly and easily; this set of three Astromania parfocal rings lets you make more efficient observing
1.25 inch 4mm plossl eyepiece set; gives the widest viewing field along with extra sharpness and long eye relief
4-element plossl design; has a approx 50 degree AFOV; perfect for broad-field lunar observations; medium-sized star clusters; and a wide range of cloudy nebulas and deep sky targets