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RF 28-70mm soft left edge or normal performance?

Started Feb 28, 2021 | Discussions thread
jwilliams Veteran Member • Posts: 6,385
Re: RF 28-70mm soft left edge or normal performance?

Try focusing on the left/right edges vs. using the center and then compare. From what you show it does look like the lens is a bit de-centered, but most lenses suffer from this to some degree. Also, do other Focal lengths show similar results? Does the difference disappear or minimize stopping down a bit? If it persists even on stopping down then it is a more serious problem as you have no means to correct it in use.

You have a very expensive lens so you have a right to be a bit more picky than someone buying a kit lens. I'd mostly worry if you aren't able to get the difference to minimize when stopped down. If it is only noticeable wide open then at least you have a means to counteract it. Getting another lens or repairing/adjusting it might just result in some other problem.

I'd think Canon would be amenable to checking it and correcting if necessary. I've only ever sent in one new lens to them that had a rather bad problem and they replaced part of the optical assembly and all was fine.  Yours may be a bit of a borderline case, but again it is a very expensive lens so I'd hope they would at least check and adjust it if possible.

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Jonathan

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