Firstly, that is an excellent image!
That is unusual, what brand of UV filter?
FWIW, you do not need a UV filter on a digital camera but there are "protector filters" available to protect your lenses from a harsh environment, like salt spray, blasting sand from the wind, chemicals etc,
The best way to protect your lens is from having accidental damage clause in your insurance
If you feel happier with a filter, thats OK as well, we all have our own personal preferences (I have a 14-24 so I just try to be careful )
Lastly, if you have a polarising filter, make sure it is a circular polarising filter as some linear polarising filters can cause focus problems,
I haven't seen this personally but be aware it can happen
And if you put a "high end" protective filter on a cheap lens, like the AF-S Nikkor 50mm 1.8, the filter may cast more than the lens!
Edited by Gary Worrall, 14 July 2015 - 12:32 AM.