I have been experimenting with and . I took a series of photos outside which had direct sunlight in them as well as shade. I wanted to keep my value the same so I took them in AV mode and changed only the , increasing from 100 up to 6400. The results were what I thought would happen with the increasing as my increased... That made sense to me, the sensor is more sensitive so the doesn't have to stay open for as long.
So then I took a series of photos inside, which was poorly lit and done the exact same thing of increasing my . The results were not what I expected...the got slower as the got higher?
Can someone please explain why this is? Obviously it is not as straight forward as I thought