Are there special filters that should be used for digital slrs?

I need some new filters for my D200. Today, at my local camera store, I was told there are new "digital filters" that I should buy (they cost a lot more) instead of the old "analog filters" because digital filters supposedly will work better on a digital camera. The salesperson, with whom I have dealt many times and is pretty knowledgeable, couldn't explain why, other than to say it was because there are differences in the ways a digital sensor and film react to light. Is there anything to this? Ever since I got a digital SLR, I have been using my old lenses and filters, and have never noticed any issue.

In my opinion its just a marketing ploy to seperate you from your money. Since film is rated as an ISO number and your digital camera has ISO settings does it really make sense to say "... there are differences in the ways a digital sensor and film react to light."? hmmmm... On second thought, they do "react" differently. Light striking film causes a reaction of the silver halides which has to be chemically processed. Light striking a digital sensor creates an image electronically.

I know for certain that a linear polarizer will not work with a camera with through the lens metering, film or digital. I also know that a linear polarizer will mess up AF.

If the store allows a return policy maybe you could buy a so-called "digital" version of the filter you use the most. Then do a side by side comparison. If you can't tell any difference then you'll know its just hype.

What he is refering to is a Circular Polarizer. Yes it must be a "circular polarizer". Not a necessary filter, but a highly recommened one. This allows you to get a deeper blue sky and reduce reflections. There is very little price difference between the two. You may want to consider an UV lens filter for your "Good lenses". This is basically a protector for your lens.

carry on with the type you are using.

ebay has several thousand filters on it..pick a good seller and the price you want..and a name brand..you should be fine if your needing new ones.