I just purchased a Nikon D810 with a 24-120mm f4 lens. I am getting vignetting on the images. I've attached 2 images, one with the 24-120mm and the other with a 18-35mm Nikkor lens. All are FX, never purchased a DX lens. This is the second D810, returned the first one to B&H because of the same thing. Nikon support said to reset the camera which I did. No change. Any feedback. Getting annoyed that I need to send the second one back.