I'm selling my Carl Zeiss Abbe (ZAO) version I eyepieces to fund a purchase here in Australia. They are all in excellent condition and are considered the best planetary eyepieces in the world. The 10mm and 16mm pairs are amazing on my Mark V binoviewer. The 4mm and 6mm are also the best for monoviewing. That's why I build up this set. Get them now for Mars opposition!