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Originally Posted by
DanK
I haven't used colored filters since moving to digital. One can get similar effects, with far more flexibility, in postprocessing. I have only three types of filters (all multi-coated to minimize flare):
1. Protective filters, which I often leave on but remove when they are likely to be a problem, e.g., if there are point light sources in front of the lens (night photography is an example). I used to use UV filters for this, but because of the point that Richard made--digital sensors are not affected by UV--I now buy simple protective filters.
2. Circular polarizing filters. A must for landscape work, etc. I now use the top level of Marumis, which are very highly rated but less expensive than some competitors.
3. Neutral density filters, e.g., to get longer exposures of running water. I don't often use these.