Originally Posted by Zakd
I'm thinking to buy the filter for outside shooting which will include some nature(landscape) but mostly portraits during sunny days.
I have seen that there are following filters:
Can you explane the use of these filters and suggest what is the best buy.
Also how the snow and sunlight are connected to these filters.
If you are shooting digital, you don't need a UV filter - most UV filters sold today are attached to protect the surface of the front element of the lens against scratches. Don't use a Skylight filter on digital - it distorts the colours.
If you are shooting film, you can use a UV or Skylight filter to block UV from the film - it can cause minor discolouration.
A polarising filter is a different animal. It's mainly used to block glare (on water, especially), and to darken the sky so it's blue, not white. You can use a polarising filter (usually circular pol) on digital or film.
That's the short version. For more info, I refer you to our good friend Google.