Hi:
There is some talk going around that a skylight (or haze or UV)-Filter will spoil good shooting with the EX3 wide-lens because it causes a lot of glow. Nevertheless, I wanna put on such a filter to protect my lens from dust, scrtatches etc.
Is that true that there are problems with such filters?
Which skylight-filter might be a good option?
Thanx!

I would not put any unnecesary filter (for protection) on the front of a lens. Lens coatings are very hardwearing and extremely effective these days. Anything you put in front of your lens will have some effect on imageing.

As far as my experience a quality UV filter will not degrade the image BUT, I have had a bad experienced with a screw on filter affecting filters that are in a matte box, such as ND filters which I use - and polarizers.
So never mix the two or reflections can occur where highlights can actually be bounced between the glass.

I keep a UV filter on at all times. Not long ago I had to replace it because a helicopter lifting off scratched the crap out of it. That was seventy bucks I didn't mind spending.

Anything you put in front of your lens will have some effect on imageing.

You are correct on this point, but I doubt that even the most critical of user would see the difference. Keep a UV filter on your lens at all times and make sure it is spotless as this camera will record any dust on the glass, especially when shooting close to the light source.

I use a Hoya slimline filter which allows the fitting of the stock lens, lens hood.