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It's not surprising that on the smaller DX sensor with slightly lower pixel density compared to the Z7 the lens earns our highest rating:
https://www.opticallimits.com/nikon--nikkor-aps-c-lens-tests/1128-nikkorz5018s
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Ah! So that was the mysterious 5*!
I didn't think of a FF lens in the APS-C scope ;-)
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Thank you
Excellent reviews
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And, of course, the cropping has a bigger impact on the corner and border measurements...
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Actually I think there was maybe a couple 5* reviews on FF (Sigma 135/1.8 definitely; maybe Nikon 105/1.4 too?); most were of FF lenses tested on APS-C for obvious reasons.