Maybe "Panoptic Like" is more typical than "Nagler Like", but Nagler designed the Panoptic! I am suprised no one mentioned the Canon 15x50IS in this discussion. The rectilinear distortion and slight lateral color allowed to maintain perfect focus out to edge in the Canons is very similar design philosophy I think, and performance on night sky is very similar in feel to a small refractor with a Panoptic eyepiece.