[Guest]

[quote name='Rainer' timestamp='1352545464' post='20913']

Hi Tom,



The slight decentering that you show in your images will quite likely

go away if you stop down to f/8 or f/11. I've seen images of the 15-85

showing much worse decentering (but typically more on the 15mm end.



So, if yours is ok at the 15mm end, especially, if the vignetting

shown in the corners of a wide open 15mm image is evenly

distributed, I would certainly keep the sample you have.



Just my thoughts .... Rainer

[/quote]

I tend to agree.

The corners on my lens show equal vignetting.

The blur shows only at 85mm and only in the leftmost 10%-15% of the frame.



On an interesting note, I found out this: When shooting upside down and also viewing the picture like that, the blur is still on the left hand side (instead of showing on the right). This is with IS on (I shot the test chart with IS off).



BTW the IS is really great. I got tack sharp images at 1/15s at 70mm hand-held :-)

But everything seems to have its price.

Maybe there is a reason the new 24-70L II still does not come with IS...