Tamron 17-28mm Sharpness Review, Moire?

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MikeNannie
MikeNannie Regular Member • Posts: 476
Tamron 17-28mm Sharpness Review, Moire?

I just received a new Tamron 17-28mm wide angle zoom. I shot a few test images last night to check the sharpness and notice some odd things in my images. Maybe this is normal, but I want some feedback from others before deciding whether or not to return this lens. 
These shots were all on a tripod with a 2 second timer. Auto focus continuous, at infinity, center of the images. I believe steady shot was also turned off.  Evening light, not the best.
1) Do you think these images are acceptably sharp?
2) You'll notice on closer resolutions that there are some odd effects, possibly moire, but I've never seen this in any other photos from my a7iii.

This section of the image is where I see the 'moire' or whatever it is

Screen shot from LR, 3:1

Same shot without the circle. 17mm F3.5

17mm F8 - same issue

28mm F8 - moire not noticed

I'll try to upload the raw files too.
I'd appreciate feedback on the overall sharpness of this lens and on the 'moire' if that's what I'm seeing. Also, would you keep this lens?

Thanks.

 MikeNannie's gear list:MikeNannie's gear list
Sony a77 II Sony a7 III Sony DT 16-80mm F3.5-4.5 ZA Carl Zeiss Vario-Sonnar T* Sony DT 35mm F1.8 SAM Tamron SP 70-300mm F/4-5.6 Di USD +3 more
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