Gene51 wrote:
I am not sure there is any real advantage to doing it in the camera, when it is so easy to do it in post processing. Even free applications like Irfanview and Faststone Image Viewer offer this capability, along with some other very minor enhancement tools. It would be a shame to have to spend $3300 just to get a D850 with that feature.
I can see one advantage that the camera would display the frame lines but it's easy enough to estimate the frame lines and also by shooting full frame and crop later would allow for shifting the crop a bit left or right if needed. You would end up with the ability to shift 6mm left or right or if you hold the camera vertically 6mm up or down. That is a good thing.