Response to old thread. Had to send an EP in last year. Not sure what Zeiss did to improve my eyepiece, possible upgrade, but after using the zoom loaner they provided side-by-side, I ultimely preffered the fixed 23/30 for eye relief mainly (eye glass wearer), and the FOV is impressive. The returned 23/30 has a much improved view, good resolution and little to no color fringing. Did not notice the yellow color tinge till mentioned but for dawn/dusk hunting applications this may be intentional. bottom line when I had the loaner zoom I could not resist 'constant adjusting the magnification', it was fun, but was almost relieved to have a fixed mag back and settle in and enjoy the relaxed. If you can find a 23/30 it is adequate magnification and enjoyable. Good service from Zeiss and the loaner was greatly appreciated.