EOS R3 Green cast in edges of the frame in low light

[davidgs]

hello every one,

I have an EOS R3 mirrorless camera, with the 15-35 RF 2.8 and 28-70 RF 2.0, I take pictures of the night sky, it is a low light environment so I set the parameter accordingly, (F2.8, 15 sec, iso6400), when I acquired the camera the recommendation of canon was not to use the profile of the lens, I did make the change and it corrected in 50%.. I replied with that information but I didn't receive more data. couple weeks ago I went to Goblin Valley UT to picture the Milky Way there this is one of the 21 frames I took for a panoramic stich...the green edges and the low resolution in the bottom

[davidgs]

this is a link to a single shot RAW file CR3

https://drive.google.com/file/d/11ftONMlVaZKCtu0eUH4Ji6Ehgv3GgHAo/view?usp=share_link

[Peter]

Google drive (don't forget to share it), Dropbox, WeTransfer, Sprend are some filehosts to choose if you need to upload some raw samples.

[Waddizzle]

White Balance could be an issue so a RAW file would an excellent sample.  When and if you do post a RAW file, try to also post a more conventional photo taken during the daylight hours on a sunny day.  

[davidgs]

The issue just happens sin low light, the pictures in daylight are just fine, I normally setup the WB to 3800-4000 range. 
I tried couple shots usin AWB and it has a similar result but the rest of the picture is brownish, as you can expected, 

I’ll upload a CR3 file later on

[davidgs]

this is a link to a RAW file single shot CR3

https://drive.google.com/file/d/11ftONMlVaZKCtu0eUH4Ji6Ehgv3GgHAo/view?usp=share_link

[Peter]

Without anything applied.

With a tone curve and increased brightness. No lens profile applied.

With a tone curve and increased brightness. Lens profile applied.

[davidgs]

I understand that with some post processing the issue can be minimized, but the issue for me is why on a canon flagship camera that spot appears in the frame, I have seen the Sony and Pentax ones because we have processed together and theirs it has nothing comepared to mines, theirs is clean. That’s what I’m trying to figured out.

[Peter]

What if you try DPP4? I tried with PureRAW and it gives a green cast hard to get rid of.

[davidgs]

Peter, thanks for your comment, my question here is why this is happening? I been side by side with a guy with a Sony 7 IV, with the same parameters, and his pictures don't have that green color cast, is there a parameter that I should change? do you guys think it is something wrong with the body?, I appreciate all your comments and solution to try to minimize the issue, but in reality what I want you help for it is to determine what's wrong when I'm shooting in low light

thank you 

[Peter]

Hm, up left PureRAW with lens correction. Up right PureRAW without lens correction.
Below left darktable without lens correction.

In your first picture you got both top corners green. I get just right one in the raw file you uploaded.

Could you please upload the raw file from your first picture here also? I am asking because you have the Milky way at a different place and more to the right corner there. Also the green corners in that picture look like something from a vignetting correction.

This one you uploaded on the other hand doesn't look like something from a vignetting correction.

Have you tried Long Exposure Noise Reduction turned on? What about same settings with lens cap on?