Color cast with certain iso during long exposure nightscapes

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Owk New Member • Posts: 9
Color cast with certain iso during long exposure nightscapes

Hello everyone,

I have a canon R5 and RF16 2.8

im shooting Milky Way nightscapes: 8s iso 800, 1600 or 3200 Bortle 2 skies

when shooting at iso 800 or 1600 I get this deep violet color cast across the image, ie the night sky is an unnaturally dark blue/ violet color.

this disappears at iso 3200. Strange, never noticed with 5d4.

I’ve had the r5 for 12m, only now shooting Milky Way with it.

any ideas?

cheers

Canon EOS R5
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