Hello all. I am finally getting a chance to do some nature photography. I will be going to Yosemite in a about 3 weeks and I'm trying to get a little prepared. I am looking into some filters needed for some shots. I think that the only way I can get this effect is by using a neutral density filter or shooting near darkness hours. Does anyone have any experience with ND filters? I can't seem to figure out what type I would need. I've seen them in; .3, .6, .9, ND2, and ND4. I will probably be shooting in bright light; around noonish or so. I am thinking about buying the ND2 and ND4. I figure that I can always stack the filters if I need a longer shutter speed. Does this sound resonable? I also want to get some better sky effects to go along with my scenery. I hear that a circular polarizing filter is the way to go. Does anyone have any samples of some sky or nature photos taken using a CP filter? Thanks to all for any advice.