Nikon Ai-S 400mm f/2.8 review
Photos were shot without converter (only 1,5× crop). With TC-301 appears more fringing, but stopped down only to approx. f/3.4, eq. f/6.8 (half between 2.8 and 4) it's gone. Despite this it's very sharp even with teleconverter. I was thinking to try it with newer APO teleconverter, but until that i'm satisfied. Sensor should not be a main cause, with other lenses it has no CA.