Dear Morton,
Thanks for the feedback, but I do need to provide you with a correction. the SharpStar 60ED is a Quadruplet, not a doublet as you recommend. Unit uses an O'Hara FPL53 Quadruplet lens.
The Astronomy Alive webpage is correct, please re check at SharpStar's own webpage at -
http://www.sharpstar-optics.com/engl...?c=msg&id=133&
Clear skies.
Rgds,
Cris.