Excerpt: I purchased this (highly specialized) polarizer for the Nikon 200-400mm f/4 lens. While I found it important to pay close attention to the instructions for removing the standard drop-in filter and installing this, I am so pleased with the results and ease of use that I now leave the polarizer in place and treat is as simply one more of the numerous useful controls that are part of this lens.
Excerpt: The filter slips in easily and securely. Easy to adjust and rotate the filter inside the lens to get the polarizing effect. Strong construction for the mount.The hard plastic case for the $[$]filter is very cheaply made and mine was broken when I received the new filter from B&H. I bought a B+W hard plastic filter case for 105mm filters for $[$]and the Nikon 52mm drop-in filter assembly and the blue foam from the cheap Nikon case fit perfectly.
Pros: Clear Optics, Easily Mounted, Easy To Rotate, Firm Mount, Strong Construction
Excerpt: I use this for photographing surfing and cricket. Very easy to use, even under a lens & camera cover on the beach (sand, salt spray) Was interesting to see a different colouring of the sky - previous CPL I've used on shorter lenses have the effect of darkening the sky, whereas this was putting a brownish colour to the sky - almost a warming effect together with removing glare.
Pros: Clear Optics, Easily Mounted, Strong Construction
Excerpt: This filter is used with my Nikon 200mm f2 VR lens. The filter as is the lens are very well built and tops in quality. Honestly, they are both awesome! That said, why the 4 Star? The cost for the filter is extreme and if you do not use it daily (I don't) makes it almost worth not having but when on the water shooting surfers, water sports & boat races or shooting buildings with lots of reflective glass, it is needed, so I sprang for it.
Pros: Clear Optics, Consistent Effect, Easily Mounted, Firm Mount, Just All Around Good, Strong Construction