Cheers!

Yes, that was a typo and I’ve fixed it. Thank you.

Well, usually a Linear Polarizer will be marked “PL” on the filter ring. Circular Polarizers are marked “CPL”. Visually they both seem the same to me.

Hope that helps.

one one?

Also how does one tell a circular polarizer from a non-circular polarizer (i.e. at a garage sale??)

Before you go out to buy a polarizing filter you should know that there are two distinct types. The older type is linear (referred to as a ‘polarizing filter”) and the newer kind is a circular polarizing filter (CP). Autofocus systems will not work properly with the older type. In other words, if your camera is autofocus, your polarizing filter should be a circular polarizer.

I find that there is less difference as you rotate a circular polarizer, although they, too, are mounted in rotating mounts.

And since the whole point of polarizing filters is to enhance clarity, color, etc – your new filter should feature an anti-relflective coating.

And one more thing – polarizing filters and polarized sunglasses are not a good combination. Take off your sunglasses before setting up that pola-magic shot.