[Hans Tucker (Hans)]

Originally Posted by Atmos

https://www.astronomy-electronics-ce...o_fsq130ed.htm

Here it is stated as a 5 element with 3 EDs

I think, well actually I was wrong about the FSQ-130ED ...Information about this scope doesn't describe it as Petzval. Looking at the AEC website description the FSQ-106ED is a quadruplet optical design where as you correctly pointed out that the FSQ-130ED is a five element design which further justifies the price. Learned something new.