Hello Everyone. I just recently bought an E-Pl2. I have tried to freeze waterfalls and waves on the ocean using Shutter Priority. however, I have been unsuccessful as my images are always overexposed, and I noticed that my aperture is fixed at f22. I tried using shutter speeds from 1sec to 10 secs. Is there anyway I can accomplish this?Is a filter necessary? I previously owned an entry-level SLR and I was able to 'freeze' the waterfall using the Shutter Priority option. Thanks and have a great day!