These are probably the most common of all mid priced eyepieces on the market today. The Plossl features both well corrected optics and very good eye relief along with a larger apparent field of view. The Plossl is a four element design that offers between a 45 and 60 degree apparent field of view with very good edge of field correction. Almost every serious amateur will have quite a few Plossl s lying around due to their low cost and very good performance. Coatings Now that we have covered the both the basics and designs we can get into more specigifc information.
Optical coating are one of the more important but often overlooked features of any eyepiece.
Good coatings can make or break the difference between finding a very dim object or not. The coating come in a few very basic levels. Usually only one glass to air surface has a layer of coatings. While this is an improvement over non-coated glass it does not offer very much extra. Most eyepieces that ship with low cost telescopes offer simple coatings or none at all.