#3. "RE: Long exposure problem" In response to Reply # 2 Thu 06-Dec-12 11:58 PM by Pete Wilson
Lake Orion, US
Your problem is with the polarization part of the filter. Polarizers don't work well on wide angle lenses when the sky is in the shot. Polarizers have the strongest effect when 90 degrees to the sun, if you point the camera directly towards the sun or 180 degrees from the sun (sun at your back) then the polarization effect is basically zero. Wide angle lenses can allow large areas of the sky to be in the photo so this effect looks just like what you see in your photo.