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We've talked a fair amount about ISO and hopefully you have been shooting with the Rebel at higher ISOs and have had the chance to see, how well it does in low light when you crank up the ISO. Even with its maximum ISO of 6400 though, which is astonishingly high, you might still run in to times when you just don't have that extra bit of ISO latitude that you need to either shoot in low light or get the shutter speed or aperture settings that you want. As you may have guessed, since this is the Custom Function chapter, there is a Custom Function that can help you with this.
I am going to go here into the Custom Functions menu and go over here to ISO expansion. If I turned this on, I get one additional ISO stop. So I am going to go into my ISO menu here and you can see, now after 6400 there's ISO H. That's High. That's One Stop higher than 6,400 which would make this ISO 12,800. Now the reason that Canon has buried that as a Custom Function is that, ISO 12,800 is actually pretty noisy and pretty grainy.
So you are going to want to do some experimenting with that before you decide, if it's really something you want to use for a critical shot.
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