The Nikon SLR lens mount has always been this way. There was probably a good reason why they chose this direction to mount/dismount their lenses when they designed the first Nikon F, but I've never seen an authoritative description of the original reasoning. It may feel "backward" at first, but if you stick with Nikon you will get used to it.
It confused me at first. Normally, you turn clockwise to screw something on; counterclockwise to remove. But after shooting Nikon for years I'm no longer confused and can install and remove my lenses with no problem.
However, now I can never figure out which way to turn a jar lid to get it off, and get confused when I'm trying to figure out which way to turn the cap on my toothpaste tube to remove it. Why do jar lids, toothpaste caps, and even actual screws work the opposite way from how Nikon thinks they should?
I think the logic is That normal moving to left usually loosens a Connection and more likely to do so. So Nikon used Left so if natural trys to backout it actually makes the connection tighter.
Jar lid Clockwise to Tighten Counter Clockwise to Loosen.
There are Many case of Left-handed tightening bolts, over history. Lug nuts for wheels on Old model Chrysler/Plymouth/Dodge cars and trucks, were Left-Handed. Some Older fords had left-handed on left side and Right handed on Right side. (Don't ask what the logic was.)
The idea was that typical rotation of Cars/Truck tires would constantly tighten a left-hand threaded nut.
In High school I took wood working class we had one student that that thought he knew more than the Instructor. a Regular Smart-aleck kid. So The teacher sent him to the local hardware for a left-handed Monkey Wrench. The proprietors the hardware usually were in on the lessons. Anyway he spent 2 hours looking for one. Never dawned on him to make one you just flipped the wrench over so it pointed opposite direction.
I love the student story. The Nikkor lens back caps are indeed reverse-threaded.
My student story was a poor fellow that was very mechanically challenged and over a period of a year wrought untold destruction in my lab. One day, while another student and I were assembling a $100,000 scientific instrument, he shared a "revelation" with us: namely, that screws always tighten clockwise and loosen counter-clockwise. He was very proud to have make this level of progress. When he left the room, I turned to the other student and said, "This would probably be a bad time to tell him about reverse-threaded bolts on this instrument."