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You need a CP filter!

What is the full purpose of a CP filter and when else would I use it? Could you post photos with and without this filter.

I don't have a lot of "with" and "without".  I did shoot that on purpose once, and the results are in this discussion:  http://www.picturesocial.com/forum/topics/exposure-correction-setti...

I have some fish in water, which were taken "with".  I will locate one and put it here...

If the water is clear, and you can position yourself, and you have a CP filter, it can all work out.

A "circular polarized" filter helps blocks sun light Trevor.  To me this photo looks to be somewhat out of focus. 

I tend to agree with you on that, if I'm not mistaken, I focused on the spider obove the water and the results were that. I will definiately read up more on filters. I do have one but I'm not sure which filter it is. I will try again with the filter I have.

In this case, what should I focus on as if I focus on the scenery the fish are out of focus and then pointless and its really hard to focus on a fish if its constantly moving and that is why I focused on the spider. what would be the best way to capture this kind of shot? Should I lock the focus on a passing fish and then take the shot when they pass by again. Please assist as I'm new at this whole fish thing.

Trevor, I've never photographed a fish before so I'm not certain how you would go about tackling that issue.  Try being patient and wait for the fish to stop swimming long enough to get a shot, maybe?

Camera Clicker may have a better answer for you than me since his fish photo is clear...

A circular polarizer filter blocks polarized light if it is adjusted to do that.  The filter rotates, you look through the viewfinder while rotating the filter until you see the desired result.  Polarized light is reflected from non-metalic objects, including paint on metal.  The light source can be the sun, or a man-made source.

Focus on what you want in focus.  Your camera has a couple of focus modes including one that will track an object, use the the mode that is appropriate to what you are shooting.

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