Lens Rentals test shows all circular polarizing filters work great, price doesn't matter ...

DL CADE, DPREVIEW:

Our friend Roger Cicala over at Lens Rentals is at it again: buying up super expensive optical testing equipment because someone asked him why LR carries the circular polarizing filters they do. The answer, until now, was simple: make the expensive one on the market their high-end rental, and the cheapest one their "basic." But is there really any difference?

That's what Roger set out to figure out, and the answer might save you a little bit of cash.

Read more, here.