I am looking at getting at getting some filters for my Minolta Maxxum 5 SLR camera. I know nothing about these. I would like to get 2 or 3 of these. What ones are most useful? And I was wondering if soft focus ones are the same as a skylight 1A or Haze? I read that a polarizing one and a Neutral density is good too. Also how do I know what ones will fit my camera? Do I go by the number on the fron of my lense, which is 49 mm? thanks for the help!