I shot with a Nikon D850. Saved pictures onto my mac. Went to look at them via Preview and everything looked fine. Went to import them into LR and ALL of them are extremely grainy. This has never happened before. The only thing that's new is the camera I used. I usually shoot with a Nikon D7000, D750 or a Canon 80D. I could really use the help on trying to figure this out. Thank you all for your time and support in this matter!
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The Mac Preview app may be applying Luminace noise reduction, which is set to 0 by default in LrC. Try adjusting it at 100% 1:1 Zoom view.