Step 3Flip the Filter and Reassemble
It is easy to check the correct orientation of a circular polariser if you get confused. Find a polarising light source, most LCD screens should work, and look through the filter while twisting it. For the normal orientation of a circular polariser if the filter gets darker and lighter then you are looking through the camera-facing side of the filter. If filter stays the same lightness but changes colour slightly (normally yellow to blue) then you are looking from the other side of the filter. For the reversed orientation of the circular polariser (for this step) the opposite applies.
Make sure you mark which filter has been flipped so you don't get confused!
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