[LewisM]

Brian did the test before and said that the green laser was invisible.

I wonder why the switch was made to ED glasses for these? Perhaps Fluorite just was not economically viable or too difficult for the Chinese opticians to figure properly (even Roland dislikes pushing fluorite and most optical factories are NOT capable of figuring fluorite). Perhaps they WERE finely figured FPL53 (fluorite enriched glass)- if I shine a laser in my Takahashi FPL-53 objective (FSQ-106ED), I have a VERY hard time seeing the green laser. Yes, William Optics and some others copped some real flak about calling their telescopes fluorite when they most assuredly were not CaF2 crystal but FPL53 instead. It was a marketing ploy - pure and simple.

What matters is how they perform.

The lanthanum glass variety sounds interesting. I have a genuine love of the Vixen eyepieces that use lanthanum.