The Most Important Filter –
A Polarizer In my opinion, the polarizer is the most important filter for landscape photography. Many photographers know that a polarizer is useful for making blue skies richer and for removing reflections from glass, water, and metal but a polarizer does so much more. Even on overcast days a polarizer has strong effects. It won’t turn a gray sky blue but it will help to saturate the colors in the scene by removing glare off of reflective surfaces. For example, on overcast days every leaf, blade of grass, and wet stone reflects back some light from the overcast sky. These reflections mute the colors significantly. Add a polarizer onto your lens, spin it around and you will see the colors intensify. Try photographing such a scene with and without the polarizer and you will see an amazing difference in the final photos.
Using a polarizer is easy, just screw it on your lens, look through your viewfinder and then rotate it until you see the effect you want. Sometimes, you won’t see any change as you rotate the filter. This happens because polarizers only work when the light is orientated on a 90 degrees axis to the filter. If the light is directly behind you or if you are shooting directly into the light (a sunset), a polarizer won’t have any effect. But if the light is to your right or left side, or directly overhead (mid-day sun, or overcast light), the filter will work its magic removing reflections, darkening blue skies, cutting through haze and saturating colors. This is one filter you’ve got to have!
The Blue-yellow Polarizer
This is one special effects filter that people either love or hate. Originally developed by Cokin, this filter is a combination polarizer that colorizes reflective highlights in a scene either metallic blue or yellow/gold while adding an overall warm color cast to the whole photo (see Photos 3A and 3B, here when I rotated the filter, the colors in the road and sky changed alternatively from metallic blue to gold. I chose the blue version in the end. Notice, also, how the filter adds a warm cast to the non-reflective parts of the scene.)
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So which one is the most important filter for landscape? i couldnt buy all..to expensive.
You need..
1. CPL
2. grad Nd Filter..
3. Blue gold filter
4. Warming Filter.
if budget is your limitation, try buy Cookin. If you want the most cheap filter you can try Tian Ya Filter. But i cannot guarantee the result, since no pro photographer use tianya..