Really strange Red noise when shooting high ISO

[mostro32]

Hi guys,
I don't know what's going on or why but I was trying to take some photos of the stars last week and came across this issue.
I find it really strange and I don't know if it's just my camera or if it's normal.
 

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The second image has a lens cap on that I was trying to take a test with to see if it happened again.

 

I also have this video... https://youtu.be/EokETKTEM-Y

Any Help would be really appreciated!

 

Thanks all 

Matt

[yali]

I'd say ISO 25'000 is just waaay to high for a crop camera.

Also in High ISO the place you're gonna see the noise the most are the dark areas. There is literally no light to be recorded, so all you see is digitally pushed noise.

What camera are you using?

Did you try to turn off LE NR?

[BlueBomberTurbo]

Perfectly normal. All sensors except maybe the best current FF ones will do that at very high ISO.

[philipone69]

Happens to me when a6000 gets hot...and it gets hot really quickly. Also iso 20000 is way too much for this one. Usually i take night photos in iso 100 to avoid noise.

 

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