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stickb0y7
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>What is your experience?
i've used a CPL as wide as 18mm
>Do you use a CP, or is it now permanently in the bag?
usually only comes out when there's a nice blue sky
>What is the way to prevent the uneven polarisation?
change the laws of physics - the uneven polarization happens because the amount of polarization depends on the angle of the sun. with a wide angle, you're getting more of a range of angles in the shot, so polarization effect varies across the shot
>Is it worth spending another £120 for a CP?
up to you - you'll end up with uneven polarization in the sky, but who knows - might turn out to look neat. personally i wouldn't get one on that wide of a lens
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