With any interchangeable lens camera your first accessory purchase should be a protective filter for the lens. These are optically neutral (or close enough) and are mainly there as a sacrificial surface to take the scratches that you really don't want on the front element of your lens. Look for a Hoya multi-coated (HMC) UV filter (colourless and will supposedly cut down on atmospheric haze) or Skylight filter (slightly pink to reduce the blue effect of distant scenery), put it on your lens, and leave it there until you either break it, or inevitably get dust behind it and have to remove it to clean it.
Some people will say that every extra layer of glass reduces the optical quality. This is technically true, and I certainly wouldn't put a £5* filter on a £400 lens, but unless you're a professional and can afford to take the risk (in which case you wouldn't be reading this) then adding a decent bit of Hoya glass between lens and subject isn't materially going to hurt anyone.
* prices of filters depend on quality and thread diameter. Some tiny filters for lenses on things like the Nikon 1 or similar may actually cost only £10-15 or so so be led by brand in that case. Hoya HMC beats Hoya, which beats Hama. Cokin screw-in filters are probably somewhere in the upper middle range. It's rare for me to see anything that's not one of those four, but Canon etc do also make their own filters. I only have one of those :-)
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