|
There’s more to it than just less glass otherwise Huygens would be highly sought after. They are good eyepieces if you have a refractor of f20 or more and observe on axis with tracking.
Surface accuracy and a high degree of polish makes the most difference to teasing out those low contrast features. Multi coatings help but I believe Brandon still use single coating and they are amongst the finest eyepieces out there when contrast is paramount. Clave too have a high degree of polish but theses have been discontinued many years ago.
|