The EDL has better glass. It's FPL-53 or equivalent vs. FPL-51 or equivalent in the triplet.
Performance is probably similar, but I'd love to see a comparison done.
The primary difference will be at high magnification and bright objects. I can see a little CA with either my AT102ED and the AT60ED. I have to be really looking for the CA to even notice it, just a Very slight hint of CA but it is there. The AT102EDL should exhibit none at all. There have been some really good discussions here on CN, about the glass being used for lenses and there is a lot more to the story than just the glass chosen for the lenses. I have owned much higher priced scopes with the better glass and they were some what of a nominal disappointment. That disappointment being not much of a difference or none at all. I am not comparing my Astrotechs with the premium brands like TEC, Tak or AP scopes, with those premium scopes you will see a difference. My Astrotechs and my Altair 102ED F/11, with FPL-51 glass manufactured by Kunming United Optics whom Manufactures the Astrotech scopes, have all exceeded my expectations for inexpensive scopes and I have yet to be disapointed by any Astrotech products. I still have plans to purchase a Astrotech 152EDT at some point this year and I can trust that it will also exceed my expectations.
HAPPY SKIES AND KEEP LOOKING UP Jethro
P.S. I pay more attention to real life reviews of a scope than the choice of glass used in the lenses. If I had, I never would have bought the Altair Starwave Ascent 102ED F/11. Having bought one, I now fully understand why this scope has garnered such a cult following even though it has the cheap FPL51 glass.
Edited by Jethro7, 15 April 2021 - 07:20 PM.