With my recent expedition to NEAF 2009, and the kind offer from fellow CNer “Gary” (Member # 10111)
to borrow his 40mm, I found in my possession two very. . .
The Pentax 2.5mm and 5mm XO series of eyepieces ("O" for visual Observation) were released by Pentax for the 2003 Mars opposition event. Based on my resear. . .
