This UV lens filter is simple enough. I'm not a professional photographer, so my standards aren't going to be that high in terms of what's acceptable. I don't find this lens filter distorts my photos, nor does it add any light diffraction to my shot. I've tried this filter with both my standard 17mm 50mm lens and my 400mm lens. Comparing the shots, I don't see much difference between the two (with and without the filter). I would have liked this filter better if it came with a better case rather than a square plastic case that doesn't even seal tightly. Other K+F lens filters I have included a round case that matched the size of the filter. It also sealed tightly to the lens. Of course, the other filters I have aren't this priced ($20 at the time of this review), so it's probably a you get what you pay for situation too. Overall, as I mentioned, I'm not a professional photographer, so I'm not as picky about the results as some others might be. Given that there's little visible difference in my shots whether I have the filter or not, I think this is a good level filter to use when you're starting out. They're affordable and will let you get your feet wet.