[Leo.G (Leo)]

Mine is manual focus on my Nikon too but nowhere near the infinity mark. I did however check multiple times and mark it with a thin line of nail polish so I can find infinity easy, I set it in the house before I take it out in the dark.
Otherwise, they are an amazing lens for the money.
Oh, live view on the Nikon D810 in the dark is atrocious, nothing more than noise and absolutely useless trying to focus on a star field. There may be a trick I am not aware of but I've not seen mention anywhere whilst having seen mention of the lousy dark performance numerous times.
I used a friends Canon 5D MkIV, I had it here for a few months, it's live view in low light was amazing.