Circular polariser and wide angle circular polarisers

[Jingles]

I'm looking at circular polarisers and came across a "Tiffen 72mm Wide Angle Circ Polarizer" and the "B+W Kaesemann Circular Polarizer Extra Wide MRC Filter", I didn't even know wide angle circular polarisers were a thing. My BS sensor went off when I saw this because from what I understand about circular polarisers is that if they are used with wide/super wide angle lenses they can produce an uneven polarising effect. Is my BS meter correct or does my BS sensor need calibrating?

I'm using a Nikon AF 24-85mm f/2.8-4D IF lens with my D600, later I'm looking at getting a AF-S Zoom-Nikkor 17-35mm f/2.8D IF-ED lens.

 

[tirediron]

I suspect that what they mean is that these are thin-mount polarizers that can be used with shorter-focal length lenses without (or with less) vignetting than that produced by a normal thickness filter. I do use a polarizer with my UWA, but you're right, it can definitely produce banding and uneven polarization.

 

[Jingles]

Thanks tirediron. I wish vignetting was the only side effect of UWA lenses.

How wide can you generally go with an UWA before you start seeing banding and uneven polarisation?

 

[tirediron]

It really depends on a number of factors including the quality of the filter itself, the angle with respect to the sun, etc. Generally I find that >20mm (DX) is not too bad.