Customers Review Amazon Product

Unobtrusive but essential
I have always protected my lenses with a UV filter. I'm not sure that the filter actually does anything because of never shot without one, but I recommend spending a few dollars to protect an expensive investment. The Tiffen brand is always reliable.

good quality
This fits with my Carl Zeiss 25mm fix lens. I use this lens and new filter with Nikon D90. I would like to notice that Nikon DSLR work well with Carl Zeiss lens F mount

So-so
The only thing this filter is good for is protecting the lens from physical damage (dust, prints, scratches, water spots, etc.) Some say that cheap Tiffen filters degrade the quality of the images, but I haven't noticed any degradation. If you want a filter that will actually improve your images, do not get this filter, go with a circular polarizer or a neutral density filter instead. It's better to crack this filter than crack your lens.

Simple UV Protector
It's just a protection filter. It's does a good work by day though it can create weird flares by night if you are trying to picture below a bright light or if there's one pointing towards you.
It also has a weird glass finish in the edges that make it look cheap (even though it is)

can't beat it for the price
I basically use these more to protect the lens and have never really taken enough photographs without one to know if they make a difference. These can be considered as very inexpensively priced insurance items for your much more expensive lens. I have one of these on every lens I own.