Disclaimer: For several years I've been doing birding....and living between about f4 and f5.6! LOL! I still thought shooting landscapes with my D810 would mean using f8 or f11. Or maybe focusing blending a couple of shots taken with different focus points to ensure a wide DOF. However... Per Thom: "Which aperture to use is still something I'm trying to come to grips with. Greg (Benz's) suggests f/8 to f/13. But f/8 is already diffraction limited on a D850. f/13 results are absolutely impacted by diffraction. The tradeoff here is acuity versus depth of field: you can't have both past f/5.6 on the D850. This is why focus shift (ugh, Nikon, what were you thinking using a derogatory term already used in optical evaluation?) becomes very important. Technically, to preserve everything the lens and camera can capture, you want to be at f/4 or f/5.6 and focus stacking to get your depth of field. And as noted above, Nikon didn't make it easy to figure out what the optimal settings to do that would be." What? Now we really have to focus stack for landscapes?