As for CPL, is not a must unless you really need it but good to have because you can really captured the super blue sky and cut through the reflection which you can't achieve through Photoshop. (Blue Sky still can)
This Picture captured with Hoya CPL to enhance the blue sky.

This Picture captured with Hoya CPL to cut through the water reflection at the bottom.

For ND filter, it can help you to slow down the shutter speed during bright day bright in order to achieve special blur effect in day time.
ND8 has been used to achieve the slow shutter in order to get the misty effect of the water current.

I used ND8 to get 15s to make the water reflection as smooth as mirror.

Sep 18 2007, 12:39 AM
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