Sony SEL 18-200mm very blurry at the right part of the photo

Question

I own a Sony a6000 and recently upgraded the kit lens (10-50) for an 18-200mm lens. The problem I face is that at the right part of the photos, mostly on wide angle, the photo is very blurry compared to the left part. I attached some photos so that you can see for yourselves. I did even clean the lens and the sensor. I have to say that the kit lens doesn't produce the same blur even though it is a bit blurry also. Is it something from the lens or from the camera sensor? Any help is appreciated

Later edit: Here are some comparison photos. First one is with the kit lens, second with the zoom lens. You can clearly see the right part of the photo is messed up.

Both of them taken at f 5.6, 32mm ,ISO 100. BTW reviews say that f5.6 is recommended at 18-50 mm on the zoom lens.

Meanwhile I got my hands on a brand new zoom lens same type as mine and look at the difference. The right part is much much better in terms of blur. Same settings.

So hopefully they let me keep this one.

Answer 1

More like the bottom right corner. On the top picture, the antenna mast at top is reasonably sharp, while people under it at the bottom are already blurry.

Likely a lens problem. Get a newspaper, tape it on a wall, and take pictures to remove all other possible sources if blurriness. If the lens is stabilized, try with stabilization on and off.

If problem remains visible send the lens to service, with the pictures.

Answer 2

The first photo shows that all four corners are significantly softer than the center, which is not unexpected with an 18-200mm "superzoom" lens when zoomed out to the widest focal length. Compromises in image quality must be made for every lens design. As the flexibility of the lens' intended usage grows, the list of compromises gets longer and the effects of those compromises get more severe. This is often most noticeable at the extremes of the focal length ranges of zoom lenses with a very large focal length range.

As expected, the center is sharper than any of the corners. The upper left and lower right corners of the first image appear to be significantly softer than the upper right and lower left corners.¹ This is usually an indication of tilt rather than of a decentered lens element. The tilt may be from one misaligned lens element. It could also be from the entire optical axis of the lens not aligned perpendicular to the camera's sensor. When this occurs with only one lens on a particular camera body, it could mean that the lens' rear flange ring is not square to the lens' optical axis.

_{¹ The rest of your test images do not show the left corners of the image with objects at distances that would allow one to compare the performance of the lens at all four corners. It's much more effective to use a flat surface with lots of detail that is parallel to the camera's sensor (and perpendicular to the lens' optical axis) when investigating how a lens performs on the edges and in the corners.}