Quote Originally Posted by Zeropoint View Post
Filter is act as means of protection for the lens.
So Visible light, Flares, Vignetting is importance and provides more easier to clean.
Better still if they are resistive to scratch.
What UV can do in DSLR? <Totally no effect.> That why comes clear protection type.
well done!

visible light/flare/vignetting tests the easiness to clean and resistance to scratch!!!!!!!