Which Polarizer Should I Buy?

I got this question today from Sandra:

Hi Kathy,

I am getting ready to buy some filters and had a few quick questions.  On the Singh-Ray filters, I see there are warming and neutral polarizing filters.  Which one do you recommend?  

Should I use a polarizing filter on both the 10-22mm and 15-85mm lenses?  I read something that indicated not to use it on the 10-22 mm lens.  

If I can use it for both, can I buy one filter and use rings to fit the other lens?  

I have been researching online which means I have seen about 100 different opinions!

Thanks for the info!  

Here’s my answer:

You want the thin Singh-Ray LB polarizing filter.  Buy the 77mm filter.  Then get the step-up ring that goes from 72-77mm.

Your 10-22mm has a 77mm filter size.  Your 15-85mm has a 72mm filter size.  The step-up ring will allow you to use the 77mm polarizer the lens with the 72mm opening.

Get the thin polarizer so the edges don’t show when using the 10-22mm lens.

Enjoy!