Thanks for all the help....the lens arrived today. On inspection it is physically flawless and no click with zooming or focusing. I took several shots of detailed subjects with varying f-stops and the 4 corners appear equally sharp so I do not suspect de-centering. I will have to see about investing in Reikan FoCal so I can do a definitive AFMA test but so far I see no issues. I will shoot a bunch of images this weekend and look at them in more detail. Unless I run into AFMA issues I will probably keep it.