Customers most agreed on the following attributes:
The glass is flawless and the filter is truly 1.0. The exposure value is exactly the same with or without the filter. The only way I know the filter is on the lens is the difference in my pictures with and without the filter - haze without the filter no haze with the filter. It does exactly what the company says it does. Simply a great filter.
This is a great UV filter. When I began getting serious with my digital photography, I never thought that filters made a difference. They do! In my opinion, B+W makes the best filters around. I've used a number of different brands and always end up using B+W. I use this UV on all of my lenses as the optics are clear. It's worth the money.
I put on the lens the day I got the camera. I think it's a definite, must have product.