If you need to do a quick shoot in the rain but don’t have a proper rain cover handy, you can quickly put together a makeshift one using a large Ziploc freezer bag. Photographer Kariann Goodkey over at Purple Summit Photography has a step-by-step tutorial on the conversion, which basically involves cutting out a whole and using gaffer tape to secure your lens hood to the “cover”. Goodkey writes,
If you are going to be out in the rain a long time you might want to get a proper cover to protect your investment though! That said I used this in over 6 hours of continuous rain sitting in the bush photographing a horse ride and my camera kept dry. After about three hours with this set up I did start to get condensation on the inside of the bag. This limited my view quite a bit through the viewfinder but I could still photograph and my camera was fine. For a quick shoot in the rain though this will work great.
DIY Camera rain cover [Purple Summit Photography]