I have been experimenting with some creative model photography in the pool. One of the things we tried, was to shoot some nice reflections near the surface. With the right angle and a calm surface, it wasn't too difficult to capture a basic reflection. So far no problem, except that all my attempts have an area where you can still see through the surface, instead of the desired reflection. How do you get a full reflection over the entire photo? Is this effect maybe due to the fisheye lens I'm using? Does anyone have suggestions to reduce or even get rid of this effect?