Corrector Lens CoatingsPosted By Dennis Freeman |
The short version is that the XLT corrector lens uses a different glass and mixure of elements in their coating.
The long version is here:
http://www.celestron.com/c2/technology_view.php?TechnologyID=2#overview
The long version is here:
http://www.celestron.com/c2/technology_view.php?TechnologyID=2#overview