help understanding a bit more about the numbers I understand the concepts of

aperture shutter speed and ISO and if I use exposure compensation and the

cameras automatically for example selecting ISO and shutter speed and I'm

controlling aperture then does it adapt the shutter speed and ISO according to

the exposure compensation amount that I've set and then does it further does it

when I'm putting it for example in I can't remember which mode because I've

had a few cocktails but that's I mean a few glasses of sangria so I put it in

program mode and I twist the ring selector on the front of the camera and

it moves the aperture but it also moves the number above it

which is some sort of size in inches what does that mean I thought that the

sensor size is a fixed amount so I don't quite know what it means