Images changed from raw to jpeg at high ISO

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MisterBG Veteran Member • Posts: 6,755
Images changed from raw to jpeg at high ISO

I recently took some stage shots of a singer.
Because of the low lighting level, and because I wanted a reasonably high shutter speed I bumped the ISO of my 5D IV up to 6400.
When I downloaded the images I noticed they were all jpegs.
I use two memory cards and the shots were jpeg on both the CF and the SD card.
As far as I can recall the only setting I changed was the ISO and the images before and after, taken at "normal" ISO (i.e. lower than 800) are all .CR2 raws.
The only images that were jpeg were the ones taken at ISO 6400.

Can anyone offer an explanation of what happened?

 MisterBG's gear list:MisterBG's gear list
Sony RX100 Sony a6000 Olympus PEN-F Canon EOS 80D Canon EOS 5D Mark IV +14 more
Canon EOS 5D Mark IV
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