Hi folks. I'm new to the forum. Glad to be a part of the community.
I have been in the business for 28 years and just recently became a Nikon person: I was a Canon/Leica/Sony Mirrorless (in that order) beforehand.
Anyhow, just purchased the D850 with a 50 1.4, all new, and I am having an issue. When I use the autofocus and focus on something at a distance ~10-20 feet away, it locks the focus. But I find that I ALWAYS have to turn the focus ring a smidge toward infinity in order to get tack sharp focus. In other words, the AF is just a tad off.
I called Nikon and the person who was trying to help me kept asking me to send pictures. But that made no sense to me because what am I going to send a picture of? Something that is a SMIDGE out of focus? It doesn't show what the camera is doing wrong to get to that point. Otherwise, he said I could send it in, but techs would simply send it back to me without an example of what was happening. Very frustrating.
Anyhow, does anyone have any thoughts about what is happening here? I know there is an AF fine tuning adjustment. But for some reason he was strongly advising I don't use that. Not sure why.
Any thoughts would be helpful. Including letting me know that I have a lemon and need to return.
Thank you in advance.
p.s. bonus points if anyone knows how I can remove the thin lines in the viewfinder--not the grid lines, but the line shown in the attached picture. Is it on the focus screen? If so, can you buy blank focus screens?