Ok, I am rather embarrassed to ask this because it seems so common sense, that I am not sure why I have missed it.
What exactly is meant by "stopping down one f-stop" in photography?
ok, I know what F-stop is... but when you stop down, do you use the auto focus, look at what F-stop the camera is automatically setting on for the image and then go to AV mode and set the F-stop down to the next level?
For instance, if I use the AF mode (green box symbol) on my camera and the camera reads an Fstop of 3.5 once I press the shutter button half way down, I then just reset the camera's f-stop down to 4.0?
or am I completely wrong and just more stupid here?