So I recently borrowed some 72mm wide angle and telephoto lenses for my dvx100a. They fit fine and seem to be very well built lenses, but when I screw them onto the camera, even with no filters on, there is a black ring around the edges of the video. I have to zoom in a bit on both to make the round edges go away. Anyone know if I am doing something wrong? Is this normal? I thought the whole point of like, lets say, a wide angle lens is that you can get more out of the frame and NOT have to zoom in, thus making these lenses pointless.