[usconservative]

I would also say to but a polarizing filter (it will reduce the glare and bring out what little color there may be a frozen environment, You need to rotate the polarizer to its most effective angle for the direction you are shooting, so if you get a lens where the barrel rotates when auto-focusing, it will be a real problem for quick shots.

Uhhhhhhhhhhhhhhhhhhh..... what? Computers, Cars, Electronics, Amateur Radio I know. Camera's you have to talk to me like a third grader about. ;-)

[mylife]

It works just like polarized sun glasses, and as with sun glasses, polarization is dependent on angle.

http://en.wikipedia.org/wiki/Polarizing_filter_%28photography%29

[Woodman]

OK I think you are serious. Remember the polarizing sunglasses and how you can see through glass like it isn't there? Well a polarizing camera filter does the same thing to scattered light. It will make the sky look deep blue, the clouds look 3d, and bring out the shape of snow covered mountains. But it only looks like that when it has been rotated to the proper orientation for the light. You will see it in a through the lens viewfinder and it will look perfect. Then the lens will rotate when it focuses or you zoom and it will look like it did before. Get a lens that doesn't rotate when it focuses or zooms and you will be a happy camper.