The AquaTech Rain Shield protects your camera equipment from rain, snow, dust or salt. They come in four different sizes ( i.e. small, medium, large and extra large ). It’s made from three-ply ripstop waterproof breathable fabric for excellent water shedding performance. While most high end cameras and lenses are weather sealed, you need additional protection if you’re going to be taking images in the rain for a prolonged period of time. If you are in a boat they protect your camera equipment from being splashed and ruined by corrosive salt water.
They come with a silicone-sealed window that allows you to see the LCD on the back of your camera and there is also a weatherproof sleeve that allows you access to the controls on your camera. You need to order a AquaTech eyepiece for your specific camera and choose the right size for your lens. I’ve used AquaTech Rains Shields for a couple of years now and I’ve been impressed with their performance in bad weather. They are well designed, functional to use in the field and bombproof if you are shooting images during a deluge.
For about six months now I have been using this great app on my iPhone4 for planning outdoor photography trips. It is called 
