What is Expanded ISO?
There are two reasons why an ISO is not made part of the ‘normal’ range: • It is considered a non-trivial drop in quality and you do not want users complaining about its performance. There may be more changes than simply more noise, colors can be affected as well. • The camera meters and exposes for the said ISO, but the results do not strictly comply with the ISO standard. When that happens, you will notice that the ISO is NOT stored in the EXIF of the image. Most likely this is due to a drop in dynamic-range at the expanded setting.
