Fred Miranda wrote: Jochenb wrote:
Earlier in this thread I mentioned that I tried 2 copies of the 135 GM and both had identical decentering. I also showed proof of it.
We are now a few months later and I decided to try my luck again. To my big surprise the 2 next copies are also decentered!
What makes it even stranger is that the decentering looks exactly the same on all. That's 4 identically decentered copies in a row! Crazy.
Whenever such a thing happens everyone would look at the camera. It would make more sense if the mount was slightly misalligned. However: I tried this on 3 different cameras (A7III, A7RIII and A9) and all show the same behavior.
Here's an example from copy #4.
Manually focused on the top right corner at infinity.
Than same shot with the camera upside down without changing focus. This shows a tilted focal plane right away.
Top right:
Bottom left:
Look how the focus is on the chimney instead of the building.
This is from copy #3.
A planar subject, shot at F3.2. Manually focused on the center.
Top right:
Bottom left:
There must have gone something wrong in the production line, with a least one batch of identically faulty lenses. The FE 55 also often had a weaker left side when it was just released. I reminds me of that.
I envy you guys with good copies. What's actually in focus looks great from this lens.
I'd say bad luck! I tested 2 copies of this lens and they were both 100% centered. One was a review copy from Sony and the other was a production model (first batch) from B&H Photo. (My personal copy)
I've had bad luck so many times, but what makes this really unusual is that all 4 copies show exactly the same decentering. The plane of focus is tilted exactly the same on all.
Sep 15, 2019 at 01:44 PM
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