My lenses are
18-55mm nikon
55-200mm Nikon

Please respond me as soon as possible because I am so scared. I have already ordered the lense cleaning pen and which is going to delivered to me pretty soon so I will use that in future and I have also ordered UV filter and lense hood

http://www.tribcsp.com/~sigma2/SensorDust01.html

http://software.canon-europe.com/files/documents/EF_Lens_Work_Book_7_EN.pdf

Go to page 133: How to deal with flaring and ghosting particular to digital photography
for a technical explanation on why glass in front of your lens will affect the optical quality.

This is a passionate topic for some, but to each his own.

My own opinion? Mount a good one, even though it’s a waste of money.

Huh?

A UV filter might help with damage if you drop or slam the lens against something. On the other hand, any hit of noticeable impact is going to deform the filter ring, making it difficult or impossible to remove from your lens without damaging the threads. And, any hit hard enough to damage the lens (and trust me I’ve dropped L glass from a camera bag without any effect) is going to damage the lens elements internally regardless of the filter. The only thing the filter could really help with is if you slam your lens into some sort of corner which would have hit the front element, but miraculously got saved because it hit the filter and shattered that instead.

So, why mount one?

Some day you’re going to want to sell your lens on eBay or Craigslist, and you want to say the filter has been there since you bought it because that’s what the buyer wants to hear.

Or, you could just buy a crappy Tiffen UV filter for $8 when you’re ready to sell the lens

Regarding the use of filter, as fo rmy reseacrh, FILTER IS NOT DESIGN FOR LENS PROTECTION, and Lens maker did not consider to use filter for protection. Instead the lens hood and the lens cover is enough to protect the lens itselt. Filter also contribute vigneting, especially in a wide lens..whatever may be the brand.. That’s why i never put any filter in my L’s series glass. But you know, business is business, that why some people advice, specially the beginners to buy a filter for protection blah blah blah for their lens..

I found a bit grouptest of UV filters, it`s a couple of years old but it`s a good read.

http://www.lenstip.com/113.1-article-UV_filters_test.html

If you don’t have a UV filter on your lens, i recommend you get one, I buy always by “HOYA UV(C) HMC Filter Multi Coated” they are good quality and quite cheap $20 or so.