I'm using B+W XS-Pro filters exclusively on all my lenses. They are slim, and very easy to clean compare to those Hoya SHMCs I used to own.

Quality wise, I have to admit... UV filters are the same. I don't know how durable are they as I don't do drop/smash test on my filters. But I will stick to B+W just for the ease to clean them. Hoya filters are really PITA to clean; often leaves smudges and clean marks all over the filter surface.

standard lens go for cheap filter ie. Hoya ... prime lens go for expensive filter ie. B+W

it is advisable to get step up ring to mount 77mm filter if financial constraint

i did a quick comparison lately when my friend drop by. I try to get the similar angle, sorry didn't use tripod, but i think it's pretty accurate. Result were consistent even though i change angle

guess which is which

UV filters are usually used primarily for protecting the front elements of the lens. There's not much difference in IQ when used in most conditions but cheapo UV filters will tend to give you more problems such as flaring and ghosting when the situation arises.

My Hoya UV filter will sometimes give bad ghosting, reflecting sources of light that is outside of the frame.

Good UV filters will give you lesser problems with flaring and ghosting but the best IQ you can get is without using any filters. How to tell? Just take off your lens filter and look at the front elements of your lens. Can you see much reflections on it? Now mount your filter and look at it again. See the amount of reflections that is visible now. The more reflective the filter is, the more problems it will give you with flaring and ghosting.

Your lens elements is specially coated to minimise problems like flaring or ghosting. That's why they are expensive. Mounting a filter kind of negates the coating's effect on your lens because the glass on the filter will probably not have as good a coating as your lens has.

It's a trade off. Most will bear with a little loss of IQ to protect the lens. Most would rather throw away a filter than a lens. Imagine if a drop of soft drink landed on your lens. Wouldn't you prefer the acid in the soft drink to destroy your filter's coating than your lens' coating?

this might help u:
http://www.calvinstudio.net/?p=523

Hoya is the best 

Kindly post the before and after 200 ringgit plus damage pics. 

p/s- Err ... normal scenery pics please ... dun wan pic of fluorescent tube la 

Kindly post the before and after 200 ringgit plus damage pics. 

p/s- Err ... normal scenery pics please ... dun wan pic of fluorescent tube la 

get the cokin filter set.. cause they come with adapter..so u can use the filter with watever size lens u have.

they got soft diffuser, ND, ND grad, polarise, star filter, radial zoom and many more..