Can you help me identify this image quality defect with a wide angle lens

Started Aug 31, 2016 | Questions thread
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rsilverst Regular Member • Posts: 124
Can you help me identify this image quality defect with a wide angle lens

I'm testing out a couple of different lenses:

Tokina 12-28mm f/4 DX
Nikon 12-24 f/4 DX

Testing them on a D7200. We're finding consistently that the Tokina is showing some weird effect around the edges of objects for anything at an aperture of f/5 or wider. For apertures narrower than f/5 the problem goes away. This happened at all focal lengths tested.

I thought this was chromatic aberration at first, but now that I read more, I don't think that's what this is, but I am not sure what this defect is. Can someone please tell me?

Here are two shots of same object, one with Nikon and one with Tokina. Look around the edges of the leaf. This is 100% reproducible and is not the result of focus issue.

Thanks for any pointers!

Nikon 12-24mm is first, and Tokina 12-28mm is second:

 rsilverst's gear list:rsilverst's gear list
Nikon D750 Nikon D500 Nikon D850 Tamron SP 70-200mm F/2.8 Di VC USD Sigma 17-70mm F2.8-4 DC Macro OS HSM | C +8 more
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Nikon AF-S DX Nikkor 12-24mm f/4G ED-IF Nikon D7200 Tokina AT-X 12-28mm f/4 Pro DX
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