QUOTE(jepertine90 @ Oct 24 2014, 04:24 PM)
I had a sony xperia Rm600 budget phone, I still go for tempered class with spigen casing. Why? Because I care about my investment, is not about how high amount of your investment vs your willingness to invest on protection, is about taking care of your gear.
Back to filter case, I have 3 Lens. So I should go naked on Kit lens, cheap filter on my 35mm f.18, and a better lens for my 17-55? Does that means DX lens doesn't worth B+W filter? Only FF worth better protection?
Just my 2 cents, every gear should get protected if you care..

Not to say I don't care. Unless you are a total klutz then nothing disastrous will happen to your kit lens. Unless you drop it from high or bang it against every surface you encounter, the lens will not be severely degraded through normal wear and tear.
You could buy a B+W filter for it but the filter would cost as much as a second hand kit lens. Going by that logic, wouldn't it be better to buy a second hand kit lens than to buy that filter should your kit lens be a total loss? Furthermore the filter size of a kit lens is not shared by many other lenses. More often than not you are going to have an expensive filter lying around with no use after you decide to ditch the kit lens so if that happens, wouldn't buying an expensive filter for your kit lens be a bad investment move?
I am not saying don't buy filter for your lenses. I am saying your filter price should be proportionate to the cost of your lens. If your lens costs RM 4k then buying a RM 300+ filter for it is justified but not when your lens costs about RM 300.
A UV filter is basically to protect the front element of the lens. If you are careful, not many things will come in contact with your front element.