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<blockquote data-quote="hark" data-source="post: 387238" data-attributes="member: 13196">As the Fish said, their purposes are different. Yes, in a pinch a CP filter can be used as a very weak ND filter, but they only tend to be 1-2 stops in strength. Usually a filter manufacturer will list the filter factor (whether it is 1-stop, 1.5-stop, etc). Some of my CP filters are light in color while others are darker. Before I had an ND filter, I used a CP filter in a pinch for this photo. It did double duty as a CP and as an ND although I would have preferred a stronger ND effect to slow the water down even further:<a href="https://flic.kr/p/nvmoQE" target="_blank"><img src="https://farm8.staticflickr.com/7366/14115649582_bf39437813.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a><a href="https://flic.kr/p/nvmoQE" target="_blank">Neshaminy Creek Waterfalls - Autumn</a> by <a href="https://www.flickr.com/people/114010553@N07/" target="_blank">*Hark*</a>, on Flickr</blockquote>

[QUOTE="hark, post: 387238, member: 13196"] As the Fish said, their purposes are different. Yes, in a pinch a CP filter [I][B]can[/B][/I] be used as a [I][B]very weak[/B][/I] ND filter, but they only tend to be 1-2 stops in strength. Usually a filter manufacturer will list the filter factor (whether it is 1-stop, 1.5-stop, etc). Some of my CP filters are light in color while others are darker. Before I had an ND filter, I used a CP filter in a pinch for this photo. It did double duty as a CP and as an ND although I would have preferred a stronger ND effect to slow the water down even further: [URL="https://flic.kr/p/nvmoQE"][IMG]https://farm8.staticflickr.com/7366/14115649582_bf39437813.jpg[/IMG][/URL] [URL="https://flic.kr/p/nvmoQE"]Neshaminy Creek Waterfalls - Autumn[/URL] by [URL="https://www.flickr.com/people/114010553@N07/"]*Hark*[/URL], on Flickr [/QUOTE]

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