Problem with ISO25 (video sample)

[jackoo]

I shot some footage on ISO25
and white became pink
http://www.youtube.com/watch?v=0lalNrN3wYM&feature=youtu.be
later the sun became too strong and I used a gray filter and I shot on ISO100 and footage is ok
shot on canon 550d with ef-s 17-85

Has anyone had a similar issue?

[ilguercio]

It is not an issue.
It's the same as Iso 50 with other Canon camera which have this value as an extended range.
While Iso 50 is just an Iso 100 shot overexposed by one stop and then taken one stop back down in post, Iso 25 is the same stuff, only doubled.
No wonder you clip the highlights much earlier (two stops earlier, in fact) so you have to expose very precisely as the dinamic range is reduced.
I can't be sure but if i am correct the pink colour was chosen to make it easier to try to recover the details in the clipped lights (so you can work on pink only, instead of white, as it might be in other zones of the frame) .

[KarateBrot]

you should read the maual

[Chungdha]

Its been told before you will get a color cast and need to color correct this in post.