lens problem?

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hi
my friend posted some photos on his fb page.
i noticed many of them looked out of focus on the left side but ok on right,he hadnt even noticed and it was on my imac i saw the problem,he had possibly just posted then without looking at them closely most of the portrait mode ones look ok yet the landscape mode ones show the problem,i told him and the same night he did some portrait shots and he said the looked ok but when zoomed the eyes were oof.
looking on net seems to be a lens decentering problem ,broken element etc
what do you think?
 
Impossible to diagnose without seeing some pictures.
 
yes when i posted this i forgot i was on my ipad and i havent got hang of posting from flikr to here on it only on the mac
 
I suspect wrong camera settings, without knowing what they were it is almost impossible to give a definite answer. Not even what camera or or lens used ,or even tested with another lens
 
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Looks like decentreing, with the blur getting stronger on the LHS as it moves across. I had a lens from Gary Coyle like that, and ir was un-fixable because it was too old.
 
it was a Canon 40d,he said the lens was if i remember 17-85 it was an old lens.
 
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It does look decentred. The right side is sharper even the background on the right is sharper.
 
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