I am new to the world of filters. I just purchased a Hoya circluar polariziing filter and will be testing soon.
My impression is that the filter is supposed to be adjustable via the free turning outer ring. However, when place to my eye and turned, nothing happens. The outer ring turns freely, but no adjustment on the brightness occurs. Is this normal? If so, then what does the outer ring do, if it does not vary the amount of light which passes through. This experiment was done in bright sun light.