I have had the same thing show up on high altitude shots, I was a mountaineer before health problems hit me like a runaway bus, and while I never had an explanation as to what caused it, using a good quality polarizing filter took care of the "problem". I wish I could remember which brand filter it was, I tried a number of them before I found one that mostly cleared it up.
Barry

Wasn't relevant to me, but, He isn't hurting anything, it's kind of like television, you don't like it, move on.

If I had early enough warning, I would put a tall ladder against the house, climb up to the roof and watch the big firecracker go boom.

Check what color space you are using in preferences, should be rgb or better.

Try model mayhem, there are plenty on there that will do TFP, and most have a photo or two so you can be as selective as you want without worrying about people being judgmental.
Barry

Go to Nikons website and go to the service page, you can get an estimate there.
Barry

I save my RAWs and final PSD files. I rarely delete anything, I can usually play with junk images for a composite.

The difference between these is the software that it comes with, that and the "draw" version is pen only, no touch. I have the draw and doubt I would use the touch feature. It generally is about $20 less than the others. Small is more than big enough, I, like the other posters only use about a quarter of the screen.
Barry

I can relate, 18 months ago I had a stroke affecting my left side, to date I have no use of my left arm and am in a wheelchair. One thing that helped me was getting a shoulder mount made by cowboy studios, I paid $25 on amazon. I was lucky (?) in that it wasnt my right hand. Think about getting a remote shutter release that you could Velcro to the left side of the camera. Good luck and never give up on your recovery, I know I still show improvement, however slight, after 18 months. Just remember that even the tiniest victory is still a victory.
Barry

Mode 2 is for panning.

I learned the vast majority of Photoshop with videos from Phlearn.com, you can look them up on youtube as well. There are over 800 free tutorials and more extensive lesson you ban buy. The guy is very good at making what he is teaching super easy to understand.
Barry