polarizer?

[symes]

It has two a ring around the outside...what function does that serve?

Thanks from the Rookie...

[robertwgross]

One part of the polarizer screws into the front of your lens. The rest of the polarizer will rotate, as you turn it, about the lens axis. The metal ring on the outside is simply a way to hold the polarizing glass in place.

---Bob Gross---

[tim]

Point it at a blue sky, 90 degrees from the sun, look thru the viewfinder, and turn the ring.

[symes]

will do...I knew the part that screwed into the filter or lens!! :)

[etaf]

also reduces reflections on glass and water

[symes]

and bald heads...:)