Most professional cameras have a burst mode function. Furthermore, if the camera is SLR, the optical viewfinder shows what happens between the images in the burst, but when an image is taken, there is a viewfinder blackout.
I understand that cameras perform autofocusing at wide open aperture.
Now, if I take a burst of images on an SLR, do the aperture blades continuously alternately move between wide-open and partially-closed positions? Does the potential movement of the aperture blades depend on whether continuous servo mode AF is used?
If I look through the viewfinder to see what happens between the images, do I see the world through a wide-open aperture or a partially closed aperture?
What if I'm using a ridiculously small aperture, say f/22? I think I can autofocus in burst mode using said aperture. Does this indicate the aperture blades actually move?