IS on and off

[Ron Kruger]

FSJ: During my tests, I'm using my 200mm F/2.8 and shooting the front porch of my neighbors house about 1/8 mile away. I'm setting the camera for tripod shots first and putting the exact center of the frame upon his front door. As soon as the shot snaps, I'm grabbing the camera from the tripod, switching IS and taking the IS on shot from the same spot as quickly as possible, but being sure to again center the frame upon his front door.
Given the focal length and the controlled framing, I doubt the exposure would change between shots as it might if I was using a closer subject or a slightly different framing.