Since the lens (18-200mm VR) is already slow enough, I stopped using my UV filter a couple months back. After reading some articles on it, I found that the current coatings on the lenses are pretty good, and that even if the lens does get scratched, very minor scratches probably wouldn't show up unless shooting directly into sunlight.
The only time I am using a UV filter recently, is when I am shooting a race (where sticky rubber marbles and specks fly off the track), or when I am shooting an outdoor scene where a graduated ND filter would probably be a better choice anyway!
The UV filter I have (I can't remember the brand off-hand) set me back close to $100.
Nikkor 50mm 1.8D (If you don't have it you need it)
Nikkor 18-200mm VR II
NAS (D300, Nikkor 80-200mm (or 70-200mm)f/2.8, Tamron 90mm Macro)
Here is my recommendation... dont use a filter. Its pointless. You have a thousand dollar piece of glass and you want to put a cheap piece in front of it?
i totally understand your point.....i dont agree or disagree as i dont really know what the difference is......i just followed what i've been suggested and add on the extra protection with a reasonable quality UV filter i presume......by adding that UV filter (the one i have).....is the image quality going to be decrease....what (bad) affect does it have........i like to learn more......i'm interested......
i think many of us are trying to buy peace for our mind when making the UV filter purchase........but if you can explain more about the technical behind the scene...that would be really help.........the UV filter i bought is not cheap compare to the lense $900.......it was like $50 for a peace of glass......
$50 is fairly cheap for a filter.... but compare to the lense which is only $900....i feel it is decent.....anyways.....the reason for the filter is for protection.....from what.....i really dont know......i'm new......from dust i guess??.....i do see a lost of dust particle on top of the filter already......if i clean the lense often with a brush......is that going to scratch the lense?........also....to test with/without the lense...what is the best way?.....because i feel that my images are already very sharp with the filter on.......what would be a good setting to test the lense with and without the filter.......like for what kinda of environment and at what focal lenght?
my camera setting
Nikkor 18-200 VR
HOYA 67MM S-HMC UV FILTER
Kingmax 4GB 150x SD