I've bought a Marumi DHG circular polariser filter and i'm not sure which position to rotate it to, it's got a little arrow on it and when you rotate it, the arros moves around it. I tried looking through the viewfinder and rotating it and thought the image would be ok, but when I got hom the bottom half of the photo is extremely dark. If I rotate it the image does change in the way of contrast etc..but then the sky doesn't look any different from what I can see to not using the filter. Here's a photo I took ealier using it.
Can you see the sky is ok'ish but the foreground is way too dark, is there any way I can get round this without having to use massive amounts of fill in in Adobe Camera Raw?