kfreels wrote in post #12954733
^Same here. A decent CPL doesn't cause any problems on a wide lens. You just have to be smart. Use a hood - as you should on a wide lens anyways to reduce glare. Some of the cheap ones will have a large threading rim that can cause vignetting on super wide lenses, but again, a decent one doesn't. I have a Marumi Super DHG that was only $69 on amazon and I have no ill effects whatsoever even on my Sigma 10-20 at 10mm.
Well, mechanical vignetting can be one issue, but I don't think that is what was originally being referenced. The general issue with using polarizers on wide lenses comes up when there is a lot of sky in the shot. That issue has nothing to do really with the quality of the filter.
The sky is not uniformly polarized. With a (ultra)wide lens, you may capture areas of the sky with significantly different polarization. This can show up as bands, e.g. light sky, dark sky, light sky. Sometimes the effect can be severe enough to impact the quality of the photograph. Sometimes it may look just fine. As you said, you just have to be smart.