I think that John B. was referring to the image being egg shaped at the edge of the field in the T6 naglers. The Pentax still shows a roundish shape in a Pentax 10mm and up near the edge of the field as well as anywhere else.
Some of the pentax XW's are incredibly , highly corrected eyepieces..and I WON'T be in eyepiece nirvana until I purchase a 10mm or 7mm Pentax XW again !!!!
