The filter you buy has nothing to do with the camera brand or model.

It has to do with the size of the filter thread on the front of the lens. Look for something on the lens that looks like a 0 with a line through it when an = and a number like 58 or 62 or 67 etc. (ø = 55mm). All you have to do then is buy a nice B&W, Hoya or Tiffen UV filter of the same size.

By the way, are your sure it is a 25-90 mm zoom? I just did a search and could not find such a lens. There are 24-70 mm, 24-85 mm and 28-80 mm lenses, but none in your focal range as stated

That said, when you say your photos are "foggy" from sun light, that is probably caused more from lens flare .. that is when the sun strikes the lens. Newer lenses have multi-coating, super multi-coating and now nano-coating which reduces the flare to some extent. Using a lens shade will reduce some flare, but if you can see the sun in your viewfinder, expect some flare, no matter what kind of coating your camera's lens has.

Link to cameras filter explanations.

http://en.wikipedia.org/wiki/Photographic_filter

In today's world of DSLR's UV filters are used mostly to protect the front element of our lenses. When shooting colour film, a skylight filter was the choice, but the most important factor with any filter was the protection of the lenses front element.

There are times when you may want to NOT use a lens filter when doing very critical detailed macro work, where even the added filter may degrade the image, but under those conditions the camera is mounted on a copy stand and is not subject to a 350 line backer running over you or you tripping on a rock and landing lens first onto a trail.