I got this new Tokina 28-200 lens for my Maxxum. Its pretty nice, but it is the push pull style, and when you point the camera down the weight of the lens pulls it down and so it zooms in, and vice versa when you point it up. Is there anyway to stop this from happening? It probably wont be that bad, and I got a really good deal on it so I'm not too upset about it, but when I use my off camera flash it will definately be a pain in the ass. Any suggestions would be greatly appreciated.