As a photographer I really try to make sure I only use reliable equipment. K&F has done a great job of being a reliable budget camera gear company. I have some of their other gear and continue to be impressed by their commitment to superior build quality and attention to detail in their products. I found the filter screwed directly onto my lens with no problem and was able to remove it with ease as well. Unfortunately I couldn't shoot a long exposure as I don't live near a waterfall and when I got this filter the weather really didn't cooperate with me. However, I held the filter to the lens without screwing it onto the lens, so I could see the difference between the image with the filter and the other. This type of test allows you to clearly identify a correctly exposed image and a slightly hazy image by showing only the "hot spots" of light in the photo. I took a few photos with the filter installed and found that there is no edge vignetting and as the glass is high quality I didn't notice any ghosts either. Overall, this is a very good option for a budget ND lens filter. that there is no edge vignetting and since the glass is of high quality I did not notice any ghosts either. Overall, this is a very good option for a budget ND lens filter. that there is no edge vignetting and since the glass is of high quality I did not notice any ghosts either. Overall, this is a very good option for a budget ND lens filter.