Apple has added the ability for the sensor in the iPhone 5 to take pictures at 4 times the sensitivity. If you're a camera buff this means the ISO can go from a limit of 800 before, up to 3200 now!
We're excited to announce that Camera+ 3.5.1 supports extended low-light shooting on the iPhone 5! To show you exactly what this means we've taken a comparison photo with Camera+ on the iPhone 4, iPhone 5, and iPhone 5 with new low-light mode. It adds some additional noise, as you can see in the 100% zoom, but it also enables you to take photos you wouldn't have been able to take otherwise.
Check out the comparison shots below and download the Camera+ 3.5.1 update now for your iPhone 5 on the app store.
Perhaps my math is off, but isn't ISO 3200 3 stops improvement over ISO 800 (and not 4 times as the article and release note indicates)?
3200 is a 2-stop improvement over ISO 800. I think the release note merely took the no. to say 3200 is 4X800 (4 times the power is their exact wording, not 4 stops better)
Thanks David, that's exactly right. ISO is both a linear and logarithmic scale. The 800 to 3200 is on the linear scale, the 2 stops are on the logarithmic scale. Both indicate that it is 4 TIMES MOAH POWER, which sounds cooler (I hope you agree) than 2 stops, which sounds like a bus trip ;-)
I stand corrected. ISO 3200 is a 2-stop improvement over 800 (1600 is 1-stop, 3200 is 2-stop). ISO 1600 is twice more sensitive to light than 800 and 3200 is 4 times more sensitive than 800.
ISO certainly is not both a logarithmic and linear measure. "Stops" are an indication of lens aperture, each "stop" doubling the amount of light transmitted. "ISO" is a linear measure of film/sensor sensitivity. Thus a 4x increase in sensitivity has the same effect as a two stop aperture increase - at least to a first approximation.
How do you change the ISO? I can only get to 800.
I think it's expressed as + or - EV (Exposure Value ". The ISO value may be an internal reference. From ISO 800 to 3200 is two stops.