I have two Sony/Zeiss FE lenses: 55/1.8 and 16-70/4. On my A6000 both are loose, meaning the lenses move with a noticeable click at the end of the movement. It seems to be a sliding up or down or right or left, as if the camera mount diameter and the lens mount diameter weren't the same. I first noticed this because of the noticeable click (in the lens mount not the shade) when attaching lens shades. The movement is greater on the 16-70/4 than on the 55/1.8. I purchased the 55/1.8 from a local camera store so I took the lens in and asked if this was normal. They readily acknowledged that yes there was movement of the lens in its mount. But although they didn't actually explain what caused the movement, they assured me it was normal and wouldn't affect my photos. What do you guys think? Can you explain the movement? Is this normal?
I just returned from a trip to China where I used the 16-70/4 for 98% of my shots. I was disappointed with the IQ from the 16-70/4 on many, but not all, of the photos I took. I am not that experienced a photographer and am certainly not technically oriented. Usually my issues turn out to be self induced - operator error. But this time I am not sure. I don't know if the issues I saw could be related to the movement of the lens in its mount or not.
I have included a set of photos to show the problem. In case you don't read Chinese, this is a noodle shop selling yellow noodles with donkey meat - the signature dish of the area. The intended focus was on the characters on the left window - ISO 250, f5, 1/1600, fl 27mm. The center is passable but look at the windows. By the outer edge of either window, but especially the right one, the image has degraded to an unacceptable level. Both lower corners are even worse.
Can anyone offer an explain as to why the IQ for the noodle shop image is so bad - or at least I think it is? Could it be due to the lens movement? Is there operator error here? Are there factors I am missing?
Thanks for any comments, opinions, or advise,