Sounds like the lens elements are decentered. I'd keep sending it
back, asking for it to be recollimated with attention paid to lens
decentering until they get it right. Many times when a lens is
recollimated, they only check the center since they assume everything
else is parallel.
KN
--
Karen Nakamura
http://www.photoethnography.com/ClassicCameras/
http://www.photoethnography.com/blog/
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