In my previous post, I made a photo of a TV image and zoomed the lens during the exposure. In the comments, there was a question whether it would make a difference zooming in or out. So I did the experiment. Here are two images of a macaw on a TV photographed while zooming the lens during exposure. For one of the images, the lens was zoomed out. For the other, the lens was zoomed in. If examined closely, you can see a small difference between the images. I think this is due to a slight difference in how fast I turned the zoom ring on the lens for each image and not because the lens was zoomed in for one image and zoomed out for the other. What do think?