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
Fully Multi-coated: Astromania 7.5mm Super Plossl eyepiece is engineered with 2 sets of 5 element design with fully multi-coated; the high-quality optics that minimize internal reflections and improve contrast
52 Degree Field Of View: The eyepiece have a wider 52 degree field of view than most eyepieces with a 7.5mm focal length to see more detail; You can choose the eyepiece with the right focal length for your telescope model which are parfocal