Alstar 1.25" 20mm Plossl Telescope Eyepiece - 4-Element Plossl Design - Threaded for Standard 1.25inch Astronomy Filters music_UK_update_2021 in terms of any problem

in terms of any problem of this product

shocks and vibrations

Only apply cork grease when the mouthpiece is hard to install

Let the tone more brighter

Alstar 1.25" 20mm Plossl Telescope Eyepiece - 4-Element Plossl Design - Threaded for Standard 1.25inch Astronomy Filters music_UK_update_2021 in terms of any problemAlstar 1. 25" 20mm Plossl Telescope Eyepiece 4 Element Plossl Design Threaded for Standard 1. 25inch Astronomy Filters This is a very nice medium power eyepiece set. 1. 25 inch 20mm plossl eyepiece set , gives the widest viewing field along with extra sharpness and long eye relief. 4 element plossl design, has a approx 52 degree AFOV. Perfect for broad field lunar observations, medium sized star clusters, and a wide range of cloudy nebulas and deep