I have a friend that has several BSA scopes and I have several Leupold scopes. Looking thru his BSA scopes you will notice a yellow color, they call a filter or coating. Well, Leupold also has coatings but do not make the view yellow. They are also very touchy dialing into focus. Their quality is less than good where leupold is excelent. Buy the best and do not test the reat.