canon 55-250 IS blur edge, anyone?

jongpl wrote:

Ya you are right, I will try proper method before sending to canon.
As for the vertical and horizontal test, the result is quite a
surprise to me, I would expecting when I turn the opposite way for
vertical shots, the blur edge will turn to the other side, but its
doesn't, instead I got the full images, from top to bottom pretty
sharp. I have a few shots besides the palm tree shot, which shows the
same results. But again they might not be a good test for my
situation.
The other thing is that when I shot vertical shot(anti clockwise) I
can actually see the weird OOF edge in the viewfinder which doesn't
shows up in horizontal orientation. I normally focus using the center
point and then composite the shots so the focused object will be
either on left or right, I have using this method with horzontal
shot, and also with other lens and none of them having this weird
behaviour. When I prefocus the center object and tilt the camera
down, I can see the object start to get really blur on top, which
doesn't make sense when the object is 80m away. I guess this is the
information I have for now, I will try the proper method to gather
more informations, Thanks guys.

if the effect is that strong, I could indeed be some loose element.
Since it seems to be mainly in the vertical orientation and not horizontal,

it could be coupled to the IS unit, since that has different parts for the two axes,
and hence only one axis might be bad.