I bought an apo triplet telescope from a chinese site when it arrived it was an ed80 doublet. When I said to the supplier that this is not what was in the description he said:
"APO structures are all 3-piece structures, which is not wrong"
Are apo doublets 3 piece structures?
The description said:
1, optical
New optical design, three-piece air separation and achromatic design, which includes a piece of ED glass made in Japan, can provide better optical performance; All lenses are processed by classical method to ensure lens accuracy.
The photo showed a telescope with an objective description (surround) saying 480mm f6 80ed apo triplet. I got sent a 560mm f7 80ed apo doublet.
What do I say to the supplier who sold me this scope?
Cheers Kanga